Borderlands 2 Interview, Screenshot

Accompanying a single new Borderlands 2 screenshot on IGN is an article-style interview with lead writer Anthony Burch and lead designer Jon Hemingway about the sequel's Gunzerker class, its skill trees, and available loot. Re-specs are confirmed, I guess:
You won't be locked into a skill tree, you can distribute points across multiple trees like in the first game. You can't learn every skill, though, and can reorganize your build if you're unhappy with your initial decisions. "We won't talk specifically about how you do respec-ing," said Hemingway, "but our philosophy has always been that it should be very, very easy and very cheap. You know in the first game respec-ing was ridiculously cheap to do and you could do it whenever you wanted. We do everything we can to encourage experimentation so the players can try out the different things."

The third skill tree is called Gun Lust, which according to Burch is "all about just doing crazy or interesting things with guns. There's one skill called No Kill Like Overkill and anytime you kill an enemy, any excessive amount of damage you dealt is converted into health for you. Once you have this skill [...] you really want a gun to finish off enemies that does a ton of damage in one shot, so it's not uncommon for us to see gunzerkers go in with SMGs or something -- some, fast, high fire rate but low damage weapon -- because you get a guy's health low and then swap to a sniper riper or revolver and get a ton of health back."