Oh man, come on Pentax please join them:
The new Micro Four Thirds standard is seen as both a potential problem but also a potential opportunity. Panasonic’s Lumix DMC-G1 is seen as a direct challenge to Pentax’s entry-level DSLRs, undercutting the new Pentax K-m in size if not price. On the other hand, Mr Iue believes that “the G1 could open up a new market which will help Pentax and the industry as a whole”, a sentiment which has also been echoed by Olympus and Sony in our Photokina meetings. Mr Iue went on to comment that Pentax are very open-minded about the possibility of joining the Micro Four Thirds system, with the company free to join any system that they like at the present time.
Pentax and Samsung Partnership Not Perfect - PhotographyBLOG
There are also some interesting tidbits about Pentax's decision not to go FF and also the future of the 645 in there.