Seth Rogan involved somehow in AMC's 'Preacher'

Only a couple hours after I posted the Preacher news teaser, Seth Rogan jumped to Twitter to make a few unprompted remarks regarding Preacher and perhaps his involvement with the series

Here is his Tweet(s)
Looks like about seven of years of hard work are about to pay off. I may get to bring one of my favourite stories ever to life.

 He then sealed the deal when he followed up his initial tweet with the following;

Arseface. John Wayne, The Saint of Killers.

Those are 3 main characters from  Preacher.
Now the question is; How is Seth Rogen involved? Producing, directing, acting? No one knows but Seth at this point.
Once again, I will keep this topic updated as much as possible