Canon Asia just released a new firmware update for the 5DMrkII. According to the documentation it does not do much:
Firmware Version 2.0.9 incorporates the following improvements and fixes.
1. Improves writing/reading speeds when using UDMA 7-compatible CF cards.
2. Fixes a phenomenon where the IS function will not work when custom function C.Fn III-2 is set to [5: IS start] and the lens attached does not have an AF stop button. This is because custom function C.Fn III-2 allows users to assign IS start to the AF stop button on the lens
3. Corrects misspellings in the menu screens displayed in Arabic, Portuguese, Spanish, and Thai languages.
You can download it here.
Thanks to Canon Rumors for pointing this out, almost missed it!