An unofficial preview build of CyanogenMOD 9 (based on Android 4.0.3) for Samsung Galaxy Tab 10.1 Wi-Fi has been released at XDA. This is purely a preview build, full of bugs, certainly not meant for daily usage.
If you want to have a look at what is coming in CM9, then you can take a shot at this build but make sure to do a full Nandroid backup. Installation process is pretty easy; you just need to have the latest CWM recovery. Do a backup, full wipe and install ROM. There is no clarity on what hardware components are actually working in this build, but according to users till now, Automatic screen rotation and camera are not working, graphics are also buggy.
You can grab the download from here.