I agree with dotted. Until we have an opportunity to test these ideas on a basic engine there is not much to be discussed upon, especially with such vigor. How can you "confirm" something without actually seeing it acting and behaving ingame.
What I suggest for now is make two lists. 1st list - creatures that make a definite comeback. Original creatures only. 2nd list - any creatures that could be possibly added. No "confirmed" stuff, only "possible" stuff. No need to start holy wars on this topic before we have an actual chance to work with our ideas.