Trent will probably get rehired a few years from now. Remember Idol Stevens? He got released and he's now Damien Sandow. I think he'll be fine as long as no bridges are burned. A loss all the same because he had serious athletic ability. Reminded me of a young Shawn Michaels type.
As for other releases, I'm thinking -
Ted DiBiase - Hasn't appeared in about a year and I hear he wants to retire to spend time with his son.
Alex Riley - Hasn't appeared in ages and is in the doghouse.
Camacho - Can't wrestle.
Ezekiel Jackson - They finally gave up.
Percy Watson- Has potential but then they turned him serious.