The keyboard looks pretty good. Obviously can't say for sure until you actually use the thing.
The OS doesn't look that bad. From what I can tell it seems to be heavily gesture based, so swiping up will take you back a level, swiping left or right will take you somewhere else, very layered. It will also have true multi-tasking, so apps will run in the background unpaused. It looks like a mix between Windows Phone and Android to me, so I should be able to use it and not feel trapped like I do in iOS.
Knowing BB, it will probably be a pile of manure.