More details surfaced about the upcoming Pentax announcements on September 9th and September 20th. In addition to the K-5 and the K-r, expected are also, at least two new lenses, some compact cameras and may be "something completely new". Still not sure how the new products will be divided between both announcements.
The two new lenses are:
The K-x and K-r models will probably coexist for a while. K-7 production has already been stopped. Some more details on the new DSLRs in addition to the specs from yesterday:
In terms of the "completely new" product, the expectations are for a new Pentax EVIL camera that could be shown at Photokina , probably under glass, just like the 645D few years back. The second possibility (very low chance) is a new full frame Pentax DSLR.