since there were no active changes in the CVS in the past few days/weeks i guess 1.9.12 against 2.4.22-rc2 should be quite the same as 1.9.12 against 2.4.22 final. I took the beta patch and applied it against 2.4.22. The 2 FAILs were very easy to fix.
grsecurity-1.9.12-2.4.22.patch.gz
NOTE: this is not an official patch, but the final 1.9.12 will probably not differ much/at all to this one.