Radiohead is one of the few bands I refuse to taint by listening to leaked versions and I will just buy the day it comes out. That being said it is VERY hard not to give this a listen.
i've given it a couple listens. to my ears it seems fully mastered and ready to go (unlike some of the HTTT unmastered leaks that sounded kind of rough).
basically it sounds like leftovers from kid a/amnesiac. not bad songs, but if this were a new radiohead album i would be disappointed, that is, the songs aren't covering any new ground, more bleeps blips beats and the occasional piano.
After the first listen I am digging it. I love his voice on it and the soothing tracks. It reminds be of "Idioteque" style wise except slowed down and mellow.