This is what Diablo3.com reports:

“A rep from Blizzard just sent me notice that there would be no more announcements at BlizzCon tomorrow (Saturday), so for those of you (ie: all of you) who were hoping that this would be the day that Diablo 3 was finally confirmed, I’m sorry to inform you that you’ll have to continue to wait. We all know that it’s eventually coming, but the waiting for the official confirmation of the third game along with some idea of what it will be like is a really hard thing to wait for. I hate to be the bearer of bad news, but I figured it would be best to tell you about this now rather than have you guys waiting around all day Saturday hoping that we’d hear more about Diablo 3. Thanks for sticking with us though… Blizzard is listening to us and sooner or later (ok, later) Diablo 3 will become a reality.”

So patience still must be the highest virtue of a Diablo fan. Seems as if we have to wait till GC for better news.