According to Gwin, there's more to the story than has been reported so far. Here's the letter he sent to his fans about what he can say so far:

I'm writing this public note to hopefully shed a little light on what's actually going on with my move to Specialized.

Reports that I broke my contract with 23 Degrees/Trek World Racing are false. My contract expired.  The one-page letter of intent I signed said there would be a “full length contract” with “precise terms” coming in the future.  The 16-page contract that showed up in late November was not signed by me because it was not the deal we had made. I have moved on to a team that gave me the contract I wanted, and these are the facts.

The press reports are inaccurate, unfair, and one-sided. Because 23 Degrees has hired lawyers and threatened to sue me, my lawyers have told me not to say anything for now. While riding for Trek, I lived up to my contract and gave them my 100% effort and full commitment.  I intend on doing the same for Specialized.

As for now, I want to let my fans know that my offseason training has been going great. I love my new bikes and I'm more excited to race this year than I ever have been. Big thanks to the Specialized family for such an amazing opportunity and support.I hope everyone understands that I cannot talk any further about this at this time, but I felt like I needed to clear the air a bit, without getting too much into the legal stuff.

Thanks to all the fans who have stood behind me.