There's now a 1.3 branch in kdev-python which is compatible with kdevelop 1.3 beta (the 1.2.82 or so tags). If you want to use kdev-python, please use this branch.
The current master branch uses some functionality which has not been added to kdevplatform yet, and thus won't compile unless you apply a patch. I'm sorry for breaking it, I'll try not to do that any more in the future.
Update: As of 01.03.2012, I reverted the breakage (I should have done that immediately... well, next time). The patch which caused it is to be merged soon, so I can revert the revert to deliver a long-overdue bugfix then. :)
Update: As of 06.03.2012, the required changes were submitted to kdevplatform and this issue is now completely resolved. This change should vastly improve the "I need to refresh the file manually in order to get correct highlighting" issues you might be experiencing.