'Sons of Anarchy' Season 4 Premieres Tonight; Watch the Promo Trailer Here

"Sons of Anarchy" season four premieres tonight at 10 EST on FX with a special 90 minute episode, and the latest promo shows us there are plenty of surprises in store.

Danny Trejo appears in the new promo, as the actor will be involved in the new season playing a character that acts as a liaison between SAMCRO and the Mexican drug cartel.

The promo also reveals the focus of season four: it looks like the show will be getting back to basics as far as Jax's goals are concerned. He wants out, but he's waiting for the right moment.

But with the cartel involved and what looks to be some shootouts with pretty heavy weaponry, there might not be an exit for him anytime soon.

Another thing to look forward to this season: as rumored, David Hasselhoff will be making an appearance as a porn star. Somehow, that just makes a lot of sense, doesn't it?

Check out the video below, and be sure to tune in for the premiere. For specific dates and times for all of FX's fall premieres, check out our Fall 2011 Preview article for the network.