This was compile by the user Korozenn on the official forums.
"""" At the beginning of the ESOTU panel at Quakecon 2015, we heard from Game Director Matt Frior that new DLC packs (in other words, major content updates like the Imperial City that will be available for purcase on the Crown Store) will be available on a quarterly basis for ESOTU.
The start of this will be with Imperial City, the first DLC pack for ESOTU, which is coming out just in time for Quarter 3 (August 31st). Later this year, Orsinium will also be released (and likely more new information on future updates for 2016 as well, such as the much anticipated Dark Brotherhood).
Hope this helps for those that missed the presentation!
Aside from this, here is the breakdown of the presentation:
Imperial City:
- Tel Var Stone system
- 12 "Roaming" Bosses in IC
- 2 New 4-Player Group Instance Dungeons for PvE in IC
- 1 Expansive Public Dungeon for PvP
- New, repeatable quests
- Imperial City questline
- Details on new item sets
- A new Prism Enchantment for Armor Pieces that apply a Health, Magicka, and Stamina Enchantment
Orsinium:
- Not much new details we already didn't know about
- At least 25 hours of new exploration content
- Coming before end of year
- BEARS
- Price TBD*
* If you do not have an active ESO Plus subscription, that is.
2016:
- Thieves' Guild and Dark Brotherhood will be two separate DLC and both are coming the first half of 2016.
- Q3 and Q4 DLC will be detailed next year.
Quality of Life Updates:
- Looking for Group (LFG): They're working on making it work better and be more intuitive. Players from any alliance will be able to join in a queue for Group Instances after the change is implemented.
- Controller Support: Their plans thus far on this is for the console UI to be seamlessly brought over into this game and that the UI will change from PC to the console UI by the touch of your keybord and mouse or gamepad.
- Removal of the Veteran Ranks: They will just keep Champion Points in place of Veteran Ranks, and you will still get new Skill Points and Attribute Points to spend through this new system. But they made it clear it will take a while to implement as a change of this caliber affects the entirety of end-game as there is a lot of content progression that Veteran Ranks are currently tied to and they're trying to make this transition as smoothly as possible