Coming Soon^TM^
But yeah, they're plugging away at it yet. Basically, K-9 sat in maintenance mode for a good while, and while it worked, there's a lot of tidying up to do yet. I imagine they'll have the Thunderbird name on it once it has some of the bigger pieces in place.
Most Motorola phones have unlockable bootloaders. The ones in their range that don't are the carrier specific models.