According to Valentin Sama Pentax-Hoya is considering to join MicroFourThirds. No other details were given.
UPDATE3: RiceHigh explains very well why Pentax will not join MicroFourThirds!.
UPDATE2: Mr Sama got this information from a senior Pentax manager. He also said that maybe the manager referred to the Micro Four Thirds as “System” or “concept”.
UPDATE: Jose told us more about the person Mr.Sama: “Mr Sama is not a photographer but a very well know and respected optics professor at the university and the autor of one of the best spanish photography magazine ever (funding member of european TIPA association BTW) and most importantly (for you), Mr Sama is the one, and only, behind DSLRMagazine website wich you have linked to a few times before.”