What powers did Gol D. Roger possess? I am a big fan of the One Piece manga. I just started watching the anime (completed 3 seasons).

I was wondering: What powers did the Pirate King Gol D. Roger possess?

Is there any chapter/episode which reveals his powers? Or is there any theory about it?
There has not been any information about the Gol D Roger power. Though there are some episode where part of Gol D. Roger are connected but information about him is very low. Main information about him are about family member, some crew, cause of death, very few information about his treasure One Piece but information of power has not been revealed. There are some more information about him in this wiki page. 

As the story is progressing lots of thing are untold or unknown which may be revealed in future.