A couple months before last Christmas (in 2006), i read a forum (supposedly started from a blizzard employee) stating that they were looking for some people to help with gaming and graphics. I also started noticing afew days before that people were talking about a Diablo 3 coming out, so I suppose it's a possibility that there will be one.
Note- I read another forum recently saying that if Diablo 3 comes out, it will take place in Heaven when Hell takes over. Just wondering if anybody had read that one yet.