Just some hours ago, I posted "Next update on Oracle Enterprise Manager 12 Launch" and here we go with the next update on Oracle Enterprise Manager 12 (Grid Control) :-)
I just saw in My Oracle Support a Note (ID 1363757.1) dated from 3rd October 2011 which is related Oracle Enterprise Manager 220.127.116.11.0 (12c). Seems that the naming convention is confirmed with 12c
dbi services blog: all about database infrastructures. dbi services - infrastructure at your service.