Phillip, at SLCC 2010, talked about how the way Linden Lab develops code would change. Effort was to be made to get changes, fixes, and new features out faster. In that line the server code team is changing how they rollout server upgrades.
There is a Beta Server Team that does Quality Assurance (QA) on the Beta grids. The group is moderated by Oskar Linden. Beta Server Office Hours are on Thursdays at 3 PM PDT in Morris on the preview grid, ADITI.
Oskar and Lil Linden explained the changes in Beta Server Office Hours (09/02). The code is still tested on the Beta Grids, ADITI being the grid most of us know and some of us use. But once it reaches Release Candidate status it gets tested on the main grid, AGNI. Previously they were rolling all the changes into a single RC and rolling it out to the pilot area on AGNI. The Quality Assurance team would try to catch the problems and get back to the development teams.

