The 9.0 kernel was meant to receive upstream security support only until the end of January 2013. It seems likely we would want to release 9.1 through t-p-u, for the first point release after wheezy. 9.1 could then be expected to get extended security support of two years from its release, which is plenty.
I do not believe the release team will allow upload of such big step (9.0 -> 9.1) during point release.They might allow migration of 9.1 from sid into wheezy yet before release based on joint request of -bsd and -security,
but I really doubt they will, as even #683739 is waiting. On the other hand, the 9.1 kernel (and libs and utils) could be uploaded into backports. Petr