Pjman - 8:40 pm on May 15, 2011 (gmt 0)
From what I have seen, all sites over 5,000 pages were heavily evaluated and their rankings have been stuck like glue since Panda 1 in my niche.
Things that seem to back up this hypothesis:
1. MC seems indicates that it is an intensive process to run this evaluation. They wouldn't run it that often.
2. The target was Article Networks (i.e. Big sites, way over 5,000+ pages)
Seems to make sense to build this into the schedule, but concentrate on your targets first.