Er...think it is secret... sorry..
But it is a really really good price.
So is the Kr. Can't speak for the K5, but for the Kr price, if its this same price on the streets, it will be KING of price/performance for 2010-2011 (like the Kx)
AF is certainly more skippy. Lens turns more hurriedly vs a K7. I'd say its improved, though nothing empirical. LV AF is very usable compared to K7 (quite like the video on Youtube that has been going around).
The thing that is so significant and scary to me is that these shots are at f8 and the shutter speeds range from 1/20 to 1/640 (over 1600 to 51200). ie. all would be possible hand hold speeds in real action.