With Fan Fest coming up, everyone's been gathering up what we already have been told. So I took the liberty of sharing it here with you guys. This is all copied from: Reddit /ffxiv

Major updates on expansion to come at Fan Fest.

Title of the Expansion has been chosen. (Letter LIVE XVII; 08/23/2014)

Support for PS3 continued in expansion.

Accompanying Soundtrack planned for Expansion. (Letter LIVE XVII; 08/23/2014)

Expansion coming "sooner than players think." (Gamescom, Dual Shockers; 08/15/2014)

Same amount of content in 2.0 to be released in expansion.

You will not need to complete The Binding Coil of Bahamut to play 3.0. (Letter LIVE XVII; 08/23/2014)

Emphasis being made on making the game "easy to understand" for players who are completely new to FFXIV who will start at 3.0. (Letter LIVE XVI; 07/21/2014)

"Many surprises" to come for 3.0. (Gamescom, Dual Shockers; 08/15/2014)

If SE holds a beta test, they will mask storyline content so as to not spoil it before release. (Nova Crystallis; 06/20/2014)

Mock up of quests, FATEs, monsters etc complete. (Letter LIVE XVII; 08/23/2014)

Dungeons Names & amount of dungeons complete.

Still doing dungeon checks. (Letter LIVE XVII; 08/23/2014)

Endgame content post Bahamut's Coil in production.

Level design currently in process.

New town mock-ups done; working on design & details.

Mock-up of the field areas complete. (Letter LIVE XVII; 08/23/2014)

New Race added.

Yugiri speculated to be part of this new race. (Unmasked picture shown to Nakamura, who gasped). (Confirmed at Letter LIVE XVII; 08/23/2014)

Confirmation of new race will be timed with Yugiri's unmasking.

Animations for new race complete.

DoW & DoM Changes & Additio
ns
Level cap increased.

Addition of new abilities & traits with increase (2-3 skills).

Leviathan-Egi & Ramuh-Egi added.

Possible revamp of entire Job/Class system. (06/21/2014; Famitsu), (Debunked by Yoshi-P on Letter LIVE XVII; 08/23/2014)

Possible additions to current job system. (Letter LIVE XVII; 08/23/2014)

Additions to job system as the level cap increases. (Letter LIVE XVII; 08/23/2014)

Possible coding of an entirely new job system for hybrid jobs. (06/21/2014; Famitsu) (Debunked by Yoshi-P on Letter LIVE XVII; 08/23/2014)

Gun Class (Musketeer) & Unnamed Gun Job.

Gun Class/Job not what people are expecting.

Producer Letter Live III depicts a dual-wielding gun class. Dual wielding guns.
Information on job to be released at Fan Fest alongside expansion. (06/19/2014; Nova Crystallis)

New jobs will adhere to orginal three roles that have been currently implemented (Tank, Healer, DPS). (Letter LIVE XVI; 07/22/2014)

Debuffer and buffer roles still possible.

Unnamed Tank Class & Job.

Unnamed Healer Class & Job.

Possible branching job roles, similar to SCH & SMN.

Skill Speed to take a larger role after the level cap is raised. (06/19/2014; Nova Crystallis)

Working on ways to solve the limitations of the job point allocation system and the cross class system for possible secondary jobs. To be explained in detail at Fan Fest. (Secrets of Eorzea; 07/18/2014)

DoH & DoL Changes & Additions
DoH Job-specializations.

Four Star recipes to be added with level cap increase.

Quests & Missions
Shiva related quests from 2.X series will lead into expansion story.

Major event to end the 2.X series and lead up to the expansion.

Expansion content will be Ishgard-centric storyline wise. (06/19/2014; Slycer)

General theme of expansion is that of "a thousand year war." (Maehiro Blurb)

Storyline will take on a darker tone than before.

New primals to be added.

Battle with Nidhogg speculated to happen at Ishgard. (Maehiro Blurb)
The Hunt (Letter LIVE XVI; 07/22/2014)

Rank higher than S to be added to The Hunt.

Rank will be on the same level as original difficulty of Odin and Behemoth FATEs.

Chocobo Content
Companion (Chocobo) stats to be increased to correspond with increasing levels of players and monsters in the future. (Grekumah, OF; 09/10/2014)

Misc Additions
Flying Mounts (unconfirmed) to be introduced. (04/11/2014; Siliconera)

Evolve-style PvP (4 vs 1, players vs PC controlled monster) being looked into for post-expansion content. (Letter LIVE XVI; 07/22/2014)

Any (or all) data posted is subject to change for any reason what-so-ever at any time prior to patch and/or expansion.

good stuff

Storyline will take on a darker tone than before.Snootles

As if it isn't dark enough already? Every patch starting with 2.1 has gotten it darker and darker.

There's no alternative, my friends:

It is the Seventh Astral Era. For less than a year has Eorzean Alliance declared it a rising time. They are the Masters of Eorzea by the will of the gods, and master of three cities by the might of their exhaustible armies. They are a dying group writhing invisibly, torn apart by internal strife and personal affairs. They are the Carrion Lords of Eorzea for whom a thousand souls are sacrificed every day, so that they may never truly die.

Yet even in this deathless state, the Alliance continues its eternal vigilance. Mighty armies cross the monster-infested miasma of the Land, the only route between the cities, their way lit by the Aetherytes, the crystal manifestation of Aetheric Power. Vast armies give battle in their name on uncounted fields. Greatest amongst their soldiers are the Warriors of Light, the Immortal Godlike Adventurers blessed by Hydaelyn herself. Their comrades in arms are legion: the Grand Companies and countless Free Companies, the ever vigilant Scions of the Seventh Dawn and the tech-priests of the Garlond Ironworks to name only a few. But for all their multitudes, they are barely enough to hold off the ever-present threat from Garleans, Beast Tribes, Ascians - and worse.

To be a man in such times is to be one amongst untold thousand. It is to live in the cruelest and most bloody regime imaginable. These are the tales of those times. Forget the power of technology and science, for so much has been forgotten, or acquired by the Garlean Empire. Forget the promise of progress and understanding, for in the grim dark Seventh Astral Era there is only war. There is no peace amongst the lands, only an eternity of carnage and slaughter, and the laughter of thirsting Primals.