Edit: Bass confirmed along with Tag mode (I think it may have been confirmed, but first screens showing it off).http://gematsu.com/gallery/dead-or-alive-5/june-5-2012/
Collector's Edition confirmed, for Japan at least. By pre-ordering either the normal or CE you get "sexy costumes" for Kasumi and Ayane, then the CE gets you 12 "premium sexy costumes", which of course is bikini/swimsuits based on the image for Kasumi's, who is first revealed (so DLC has gotten so pathetic and out of hand we now have to pay extra for fanservice, even in games by the masters of fanservice
). Besides that is a visual book, soundtrack, 8 character post cards, and 10 special character metal plates.
Also Sarah, Akira, Hitomi, and Kokoro's renders were released (at bottom of link in gallery).http://andriasang.com/con1c4/doa5_collectors/
I find Hitomi's "improved" redone face a huge downgrade.... She looks kind of babyfaced to me.