With the merging to trunk, Multicore doesn't really exist as a separate project. The last major milestone that is likely to have a multicore-dominant discussion thread is probably the 5.0 release.

As someone who has worked so long on the project, how do you feel? Relieved?

Hah. I only contributed to the project for about half it's life.

There's still a lot of work to be done before 5.0 is released, it's just it'll happen through the usual PR and review process rather than a separate one.