Since I've never used Odin before, I was a little bit afraid. So I read about it in the internet and decided it was not a big deal...
Soooo simple! Everything worked just fine!
Downloaded the firmware from Sammobile (links above), flashed via Odin, and now enjoying Ice Cream Sandwich running smoooooth in my galaxy tab 8.9.
No more waiting for Sansung to realase it via OTA here in Brasil.
Anyway, is there any chance of Jelly Bean????