I can totally see the guy from the first link as Loki. Most definitely.
Now, as for Sherlock Holmes... Holmes is supposed to be damn near asexual, and rather more reservedly sarcastic than portrayed in the trailer. Robert Downy Jr. seems to be well-suited to the eccentric portion, though. Well, this will be a somewhat different Holmes than most are used to, I'm sure, but I'm willing to give it a shot as an AU version, I think. I'm going to reserve judgement for the moment, but I'm hopeful.