By the power of truth, I, while living, have conquered the universe.
I absolutely love the look of the Watcher, looks very interesting. The Crawler, for some reason, reminds me of a cross between the Doberman Gator and Blind Wolf that Bungie cut from Halo CE and 2.
I don't think that these will be the main enemies though, they look more like they'll be Requiem's ambient life.
[Edited on 05.12.2012 9:26 AM PDT]