Wow, I understand, but this is scary stuff on a live commercial site. WordPress took a credibility hit on this update.
The upgrade is more trouble than it is worth; has cost, probably millions of dollars in time, for all those who were very devoted – until now.
WordPress has 57% of the current CMS market, growing exponentially. We would love to see that direction continue, but they are wasting some valuable capital with 3.5.