My guess is that it's Morbius. Marvel brought the Lizard back into one of Spider-Man's arcs leading up to this movie's release and they plan to start a new arc involving the Lizard that will also have Morbius in it (source on this very website: http://www.comicvine.com/news/marvels-big-san-diego-comic-con-announcements-all-in-one-place/144947/).
Marvel intentionally shined a light on the Avengers characters in comics due to their movies coming and they plan to do the same for Guardians of the Galaxy now, so I wouldn't be surprised if this is their way of indirectly confirming it to be Morbius.
Also, the game based on the movie is touted as having a story that takes place after the movie's storyline and it features Morbius. "Michael Morbius appears in The Amazing Spider-Man video game (based on The Amazing Spider-Man).[40] He is biochemist who is forced by corrupt Oscorp executive Alistair Smythe into creating Rhino. In a discussion between Spider-Man and Dr. Curt Connors, it was mentioned that Michael Morbius was studying bats as a means to cure his rare blood disease. He is mocked by his fellow employees for being reclusive, hence his nickname "Morbius, the Living Vampire"." (taken from http://en.wikipedia.org/wiki/Morbius,_the_Living_Vampire, go down to "Video Games")
It seems like it could "add up" to being him.
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