This really is a question for donncha but I feel that everyone will benefit from the answer.
So donncha, a few people are starting to get near the 32K blog problem limit. Is there going to be anything "official" added into the nightlies to address these problems?
The reason I ask is that I don't want to start working on a fix and find later down the road that it's going to cause compatibility issues.
At the moment, i'm thinking a scaled down version of what wp.com runs on. The reason I say scaled down is that I seriously doubt anyone here is ever going to have 250K users and if they do, then they are going to need to have a few techs on payroll anyway. Maybe have the code in the nightlies support spreading users across 8(or some other small number) databases instead of the large number wp.com uses. Even if there were 128K users on a wpmu install, that would be 16K users per DB instead of 128.