The expansion pack will provide new places, equipment and increase the difficulty but there will be no increase the level cap.
It is hoped PvP mode will be in the game by the end of 2012.
Jay has not beaten inferno difficulty, as a solo player or in a 4-player multiplayer game
If a player was to read the lore, interact with the environment, access 80% of the game content then you are looking at 15-20 to complete normal difficult.
Other info in there. Kind of disappointed about no level cap increase, it goes against what they were saying earlier. Oh well, still an amazing game. Inferno looks to be really hard if even the devs can't beat it.