See: http://www.pentax.jp/japan/imaging/digital/slr/k-r/ex.html
(Japanese)
Well, aren't they so familiar and that we did have seen something very similar somewhere before?
Here it is! http://www.pentax.jp/japan/imaging/digital/slr/k-x/ex.html
Everything made clear now? Um.. Frankly, the K-r is just a K-x with a Li-ion battery and a different repackaged outlook! I'm afraid.. :-|
All in all, the only major and significant difference between the K-r and K-x is.. The *Price*!