the big deal is, that they have a house convention and a 20 year anniversary of the franchise. you either time your schedules to accomodate the con to be able to feature d3:x2 or d4 or you at least try to add some content and works or celebration in some way. you don't just go through your WHOLE portfolio and leave ONE game completely out.
Ok everybody calm their tits. They said there wasn't going to be any new announcements at Blizzcon like a month ago. Still plenty of stuff to do in the upcoming season with all the old builds coming back. Bored with seasons? Go play HC. Still bored? Go play other games and come back when they add something new. Whats the big deal?!
and sorry, to cop out and say "we have nothing to offer this year" doesn't make it right or does the franchise any justice. they really have only a skeleton crew working on d3 at the moment, they could really just admit that.