Gamespy asks Jay Wilson from Leipzig GC how random generation dungeons is so hard and unsuccessful sometimes to other companies and not for Blizzard. PvP gameplay is another topic discussed in this interview. At this point, PvP is merely in brainstorm-ideas mode, and not fully worked on. From what Wilson answered, it is obvious they wish to change how PvP worked in Diablo II, and make it more suitable for every player without the exploits associated with it that usually discourages players from playing again. Can you say, Gankers no more?
Other topic discussed was Diablo 3's financial model, whether it would be free-gameplay, subscription model or micro-transactions model. Read the three-pages interview