Update: Delayed to Wednesday.
As reported on the 19th of August, Cyanide are currently working on a new patch which will fix the reported problems with the AI (weird sprints, too large groups in hilly classics).
While we haven't heard much since, we'll find out on Tuesday whether they have managed to fix the problems. On thet day, they will release a beta patch, making it possible for the community to come up with reports before they release what's hopefully the final patch for PCM10.
Cyanide also mentioned the stage pack which has been postponed. No date was mentioned, but it's quite likely that it won't be released until after the release of the game patch.