'Bourne Legacy' Trailer Does Nothing To Clarify Its Premise

I wasn't Bourne yesterday. Sorry, I had to say that. The new Bourne Legacy trailer has hit the Internet, and while it looks to be in keeping with the previous Bourne installments (equal parts shoot-'em-up and political/spy thriller), what we don't know is why Jeremy Renner's character is in The Bourne Legacy? "He's Treadstone without the inconsistency." "He's an Outcome agent." "We've never seen evaluations like this." Thanks, trailer, but that doesn't really answer my question. This preview of the fourth Bourne film, the first without star Matt Damon, shows us Jeremy Renner getting indoctrinated as an agent, under the tutelage and supervision of the added Edward Norton, but it's unclear from this clip exactly what the connection is between him, Treadstone, and Jason Bourne. Oh well. I'm sure it will be explained, as Bourne has proven pretty methodical with its plodding. On the other hand, he jumps on a tree in the snow, and that's pretty darn neat.