I agree... Rampage and Tunnel Rats really weren't all bad. Relatively decent films considering the reputation of the director. However, for as sure as Boll sounds in the interview, absolutely nothing has been confirmed by either imdb or Dolph himself...
This may be a good thing for Boll's career, but for Dolph's it could be a disaster. Yes, he's done some laughable films in the past that he has fully admitted were paychecks that sounded much better on paper (Agent Red, Last Patrol, Bridge of Dragons)... But at this point in his career, I can't imagine him going down this disastrous road and agreeing to it... that is until we get firm confirmation.
The possibility does exist that perhaps he would do it as a deal where he would in turn get financing for his own project, yet again, I can't fathom that Dolph would actually want to associate himself with Boll in a partnership deal...