Like someone said before, "No Peace On Earth" sounds like a tag-line, and would be fine as one at X-mas. I'd either call it "Aliens Vs. Predator" (maybe slightly confusing, but they could use both of the old-school fonts for the names which would be cool), or "Alien Vs. Predator: *something something etc etc*". I'm not hugely keen on them putting a "2" in there, as it seems a lot has gone into this movie to make it better than the original, and shouldn't be too associated with it - but if it follows on directly from there, then perhaps it should be called "AVP2" to show continuity?