From the way I saw it they said they wouldn't be announcing anything other than Eva related announcements.
Season 4 will not be announced by a fan asking a question.
Besides, we know about these online cons, they really aren't even worth watching (IMO), much less getting all excited about them announcing things.
I couldn't have said it better myself.
Breaking News!!! Season 3, Fifth Voyage is delayed to April 19th!!
http://www.rightstuf.com/cgi-bin/catalogmgr/CSFHYeVamXbKLEGDgN/browse/item/90065/4/0/0
I can't tell if that's good or bad news…