The BizTalk Services CTP will be switched from the "R11" to the "R12" release starting in about 30 minutes and we expect to have a 2 hour time window (1400h-1600h PT/2300h-0100h UTC) where existing service accounts are being rolled over to the new release. We're expecting to be done with the migration by 1600h. Once the migration is done we'll give you an update on what's new in R12.