According to the Spanish site Quesabesde.com, Pentax will introduce two new dSLR models in Photokina; both will be APS-C (no full frame), one will be intermediate between the K-x and K-7, and the second will be above the K-7. In principle both will be complementary (rather than replacements) of the current range of models. They also mention that this information fits with recent rumours speaking about the names "K-5" and "K-7 Super". Hence one could infer that the K-7 super will be an improved version of the current K-7, with some specific changes but based on the same body; while the K-5 would be a model different from the K-x.
Good news for Pentaxians, as they will strengthen the introduction of the medium format Pentax 645D in Europe and the USA.