I honestly didn't think it would happen, due to Fox being apprehensive about doing an R-rated, ultra-violent, humorous, over the top comic book film (a Deadpool movie done right).
I'm still worried they may try to tone it down to go for a PG-13 rating in an attempt to increase box office (since R-rated films, especially R-rated comic book films, usually don't do well at the box office). However, much like Dredd, with good word of mouth, it could recoup costs and profit hugely on DVD.
Hey, the power of fan pressure...
But anyways, even if they did make it a PG-13 movie with Deadpool's brand of humor (even watered down). Would still be entertaining. I mean look at the test footage. That wasn't too bad (violent and language wise) and everyone thought it was amazing.