I believe I heard on a devstream that the sacrifice is slated for update 24 when it ships. The next mainline would be update 23 sadly. Let me see if I can find the link that said Update 24 was what they are shooting for.
Then again you might be right. All I can find says that Update 23 at the earliest, Update 24 at the Latest. Although in last devstream they said they wouldn't say more about it and that it would be out when it is finished. But Steve did say at one point it was slated for one of the two Mainlines above....... but it isn't DEfinite