So.... is it to be a CGI movie? Officially in the Fox X-Men universe? Or is it going to be live-action and the "leaked" "test footage" was just a "proof concept" that the character, mostly true to the comics rather than the abomination in "Origins" and was done in CGI for convenience/time?
Anyway of the movie has the same tone as that clip I think it could work. I'm not greatly familiar with Deadpool from the comics (Eat it, Liefeld!), so I don't see that there'd need to be a *great* need for it to be Rated-R. You can get away with a lot as far as violence anymore in a PG-13 movie and any cursing can be handled pretty early on, have DP burn his one "Non-sexual F-Word" and then try and use another one, bleep it, and then have him rant to the audience/the camera about how they're restraining him for the better rating.
As said above, it could be done smartly especially considering Deadpool's "ability" to break the fourth-wall so it'd be easy to acknowledge the tamer rating and to play with toeing that line.
Oh, and nice work there, trailer, in the use of "classic" music from the 70s on an old-school playback device. You're not trying to invoke "Guardians" at all, I'm sure.