User blog comment:Blood Reaper/Skyrim Dawnguard Trailer/@comment-75.88.6.205-20120601045327/@comment-5060344-20120601085905

I can't imagine that they would include a shot of a Falmer at random, given that there are other new enemis like the Ice Giant. Although I doubt that the Falmer would side with anyone and I'm fairly certain that the Vampire Lord guy was a Nord, which makes an alliance even more unlikely given those two races history.