I thought Sandy Bridge was being revealed at CES 2011, which is January 6-9 so the new ones could come out before the 14th, couldn't they...if that information is true?
Apple currently should have some SBs with them now for testing purposes, but i don't think there will be enough time for Apple to incorporate SB into MBPs and go into production by Jan 14th. The time is just too tight, and Apple won't be able to make it.