Per Adrian Wojnarowski:

From the Kings perspective, I like this trade, as while it's about the same salary and years (Terry has 1 more year at $5.85 million and Evans has 1 more year at $1.77 million per ShamSports)  coming back to the Kings, it chops it up into smaller, and thus more moveable pieces.  Terry is also much more equipped to play as a roleplayer than Thornton, and Evans provides the Kings with a defensive big man who is also a fantastic rebounder.  Terry's also got experience running the point even if it's not his primary role.

The Nets aren't averse to spending a lot of money for their team, and if they think Thornton can rediscover his offense on their bench, more power to them.

UPDATE 1:00 P.M.: As cerpy pointed out in the comments, Jason Terry had a 7.5% trade kicker activate when he was traded to Boston.  However the trade kicker can't activate again so it won't factor into this deal.

UPDATE 1:16 P.M.: Woj's story on the rumors is out now, and there's not much new other than that no deal is imminent and that the Nets don't want Jack's long term salary.