The Z ultra will be the first Sony Z device to get Android L :http://www.androidpolice.com/2014/10...eries-devices/
According to Sony, the Sony Z Ultra Google Play edition is up first, which isn't a surprise. After that you can look forward to updates for the Xperia Z, Xperia ZL, Xperia ZR, Xperia Tablet Z, Xperia Z1, Xperia Z1S, Xperia Z Ultra, Xperia Z1 Compact, Xperia Z2, Xperia Z2 Tablet, , Xperia Z3, Xperia Z3v, Xperia Z3 Compact and Xperia Z3 Tablet Compact. Awesome, right?
Sony's (non-GPE) upgrades will start in early 2015 with the Xperia Z3 and Xperia Z2 devices, and will continue on from there. I wouldn't be surprised if carrier integration held up a few OTAs, but at least Sony is committed to getting this done."