OG Transformer already has a rooted ICS ROM
So, essentially the rollout began, and MrNago at xda got his work done lickety split. The amazing thing is that this ROM can be flashed very easily, just like any other custom ROM. Usually, OTA updates like this don't allow that, but MrNago has got this working all around.
Just one warning: if you have a model TF101G, do not install this as there are a lot of issues with random reboots and bugs. The only known bug so far with the ROM on other TF101 versions is that USB to PC may not work, so you may have issues with ADB.
source: XDA developers