I think the later Barefoot controllers were public enough, with the two different speed grades of Barefoot 3 being used in the OCZ Arc 100 and Vector 180 (which still exists as the VT180): http://www.anandtech.com/show/9009/ocz-vector-180-240gb-480g...
But it's a dead end and last I heard Toshiba doesn't plan on doing another revision of the silicon to update it with anything like support for SATA link power saving modes.
I'm not sure how public this is, but there were many more Barefoot controllers made and tested and a number of the later-generation OCZ drives were based on a much newer Barefoot-based controller.