The tentatively-named Pentax KQ mount adapter, shown to press and public at an experience event in Osaka, doesn't provide any electronic or mechanical connectivity between lens and camera. It does however feature an aperture ring built into the adapter itself, catering to newer K-mount glass which lacks an aperture ring. Due to the extreme difference in size between a standard 35mm frame and the 1/2.3-inch type sensor used in the Q, lenses mounted on the KQ mount adapter will yield an approximately 5.5x focal length crop. This obviously makes wide angle shooting an impossibility, but provides intriguing possibilities for telephoto use. Even the extremely compact smc Pentax DA 40mm f/2.8 Limited lens would offer approximately the same field of view as a 220mm lens on a 35mm camera, and with the DA 70mm f/2.4 Limited you'd not be far off achieving a 400mm telephoto from a lens you could slip in a shirt pocket.
Of course, that doesn't include the KQ mount adapter's own bulk, and while we don't currently have dimensions or weight for the adapter, photos shot at the event by the Impress Group's DC Watch tech blog suggest that the adapter isn't a whole lot smaller than the Pentax Q camera body, overall (and quite a bit thicker). That's not surprising, given that the mount adapter must cater to the backfocus distance required by K-mount lenses, which is close to 1.5 inches greater than the Q-mount's backfocus distance. Note, also, that no information has been disclosed on planned availability or pricing for the adapter. Still, with the ability to offer a 1650mm-equivalent telephoto using the DA * 300mm f/4 ED (IF) SDM, the strongest telephoto in the company's current K-mount line (and with even greater potential from historic and third-party glass), we're sure prospective Pentax Q owners will find the possibilities intriguing.
Japanese-language speakers can find more details on the DC Watch blog article, which also includes a number of photos showing the KQ mount adapter alone, mounted on the Q camera body, and with lenses attached.