You beat me to it Edvinas.
Supposedly official from Pentax Europe. This is the precis:
Quote: -K-5 will be above K-7.
-K-r will use BOTH a lithium battery and standard AAs (brilliant!), and will cost 699€.
-EVIL will likely be APSC.
Plus
"The K-r will be superior to the K-x but don't expect it to be miles ahead. He said he has no technical details at all, which is a shame"
and
"the little one will be announced early September, the big bad one in the second part of September. Both will be the best Pentax camera ever made in the digital age for their specific prices"
One caveat is that the OP in the dpr article has a name that seems to translate as White Shark.
Also I don't think it would be a good marketing idea to have K-r as a camera name. Too easy to corrupt it to K-r[ap].