Sony is working hard to get out the Xperia Z tablet in the coming days. Well, the CyanogenMod is ready for a release of CyanogenMod 10.1 for Xperia Z tablet.
The ROM is based on the latest version of Android, Jelly Bean 4.2.2. However there is also a newer build for CyanogenMod 10.1 for Sony Xperia Z Tablet, but still it is advised to stick to the released candidate.
Sony had recently added the Xperia Z tablet to list of devices to have pure android treatment, so if it might still win you the safer side, on the Tablet though. Here is the download link to Download the Cm10.1 for Sony Xperia Z Tablet.