According to the LA Times' 24 Frames, the powers behind the solo Deadpool movie, as well as Ryan Reynolds(who will hopefully play The title character) are very impressed with Berg's short film Carousel as well as his other video/commercial work and he is being considered to helm the project.
If Berg is to get the gig, it seems like a big risk for Fox given that the script is so difficult to translate to screen. Going the unknown, inexperienced route is quite a gamble. Robert Rodriguez was previously attached to direct, but had to turn it down because of scheduling conflicts. All we know about the film aside from that is Ryan Reynolds will PROBABLY play the Merc With A Mouth, and that the script(providing it doesn't get butchered) is a thing of beauty.
Here is Berg's short film
Carousel