So, I spoke with Dries about this and he said go ahead.

There are some reported issues with 4.6.3 and php5 (and misc other stuff). Let's see if we can get some folks to look at the issues for 4.6.3 and any that have patches for them, test (only test 4.6.3 not HEAD) and review. Pay paticular attention when you comment.

Dries said if we can get some good reviews on pending patches he is willing to release a Drupal 4.6.4 soon. If we can get this down early enough this weekend (Saturday night), maybe we can get this done before his business trip.

I have more news about a 4.7 release candidate timeline, but will post seperately. In the meantime, lets see if we can get some quality reviews on pending patches (or some more patches to review as well)