Here is what we know so far:
- The game is less than 10% complete. It is scheduled for release in 2013.
- It will use the same servers and character data as the PC version.
- Gameplay will be online only.
- It is possible that cross-platform parties between PC and Vita clients will be allowed. This is briefly shown in the video.
Credit goes to Mike for bringing us this exciting news. You can discuss this news in this forum thread.