The latest release from the FreeXperia team, build FXP327, brings with it unofficial CyanogenMod 11 (Android 4.4.4 KitKat) support for the Xperia Z2 Tablet. The same build is also available for the Xperia Z2 for the first time too, although official CM11 nightly builds from CyanogenMod have been available since the middle of last month.
The download page for this latest build can be found here. Look for “Castor” for the LTE Xperia Z2 Tablet and “Castor Windy” for the Wi-Fi version. If you want to try the Xperia Z2 build, look for the “Sirius” build.