Going by his hair and how he looked out of sorts I'd imagine it had something to do with a fallout with his family or he's either been found out, or he's in a brutal war and he's going to try to end it or something. I can't see him fighting it out with the cops since he'd be against his brother, so probably a cartel.
Considering he had a fake name/id, was in California and was getting an under the table car loaded with heavy machine guns...I'd say he's experiencing a fallout of some kind.
That being said, I think it was last season (or the season before) where the flash foward had the teddy bear parts floating in his pool, and police agents seemingly "collecting evidence" from it.. That turned out to be something completely opposite of what you would expect. The writers are so brilliant that I have a feeling it's not what it seems. Maybe some kind of drug kingpin road trip adventure?