Maybe they will explain why Sabertooth is less feral than he is in X-Men...trailers aren't meant to reveal the entire story.
It is the job of fanboys everywhere to be nitpicky and bitchy about every little detail. Don't rob them of that one small pleasure!
Advocating basic logic and basic continuity is being fanboyish? The reason I raise this question is because if the filmmakers appear to be lazy in regards to minor - but obvious - things like this, then what else will they be lazy with? I agree it's too early to tell, but my doubts are raised.
Although according to Wikipedia I have nothing to fear about the Deadpool thing(which is the main reason I'll see this movie. Fuck Wolverine.), so my doubts are a little at ease.