K2 Release Candidate 6 has been released. This release of K2 is fully compatible with WordPress 2.5.
I will be using K2 release candidate 6 as a base for Unwakeable 1.5. You can expect to see the release of Unwakeable 1.5 later on this week. You can download it from the official Unwakeable page.
Head on over to the K2 release candidate 6 announcement post for more details on the latest K2.