Kelley Linden has put an update on the SL Wiki about Mono 2 (Mar 1, 2011). About a week ago I published Second Life Mono2 Scripting Coming writing about the coming scripting changes. Kelley’s wiki entry brings us up to date.
As of March 1, the roll outs moved Mono2 Aware code to the main grid. With luck the Mono2 code will move into the Main Server Branch of the code, a library thing. Shortly after that it will rollout to the Release Channels. So, may be by the end of the month the main grid will be on Mono2.