These were translations from several interviews conducted on Jay's Taiwan press tour.
Source:
http://diablo.incgamers.com/blog/comments/jay-wilson-taiwan-press-conference
-The PvP system is still in a period of change and there is no definite schedule for its launch but the PvP system will be a completely open game mode. However, skills in their nature will remain the same, such as damage output, stun period, for example, may be reduced in PvP.
-Nothing specific has been decided regarding public testing of the PvP mode but do not rule out a similar system to World of Warcrafts Patch Test Realm (PTR).
-It is hoped PvP mode will be in the game by the end of 2012.
-In PvE mode there will be no means to kill other players as that
ruins the fun of the game.
-If demand is high they will consider having a Chinese interface with English audio.
-The expansion pack will provide new places, equipment and increase the difficulty but there will be no increase the level cap.
-There will be no ladder in Diablo 3.
-Skills should be similar as they are in the beta, possibly minor fine tuning will only be required.
-Character customization was a little more elaborate to begin with. Initially 8 or 9 hair and beard colours were designed for the Barbarian but once in game it made such a tiny difference and when wearing a helmet the differences could not be seen at all so they decided against this level of customisation.
-Dyes will allow you to customise your equipment. An invisible dye on body armour will make your character look as if they do not have body armor on.
-The third artisan (Mystic) will return but her role will be useful.
-The interface will not change but possibly minor tweaks.
-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 hours to complete normal difficulty.