I am betting that the report that we read last summer about seeing the classic xeno head on the what no appear to be crew bodies are what we'll be seeing at the end of the film. What gives it away is the description of the creatures with some kind of blueish space suit on.
I'm still not convinced that report was anything more then bullshit.
Unless what we're honestly buying into/believing here is that the crew of Prometheus, or what's left of them by the end of the movie, are all seen huddled together in their suits with mishapen alien-like heads?
I... I really doubt that.