Today they've announced (as promised) that the Z1 (and compact), Z Ultra are getting the updates.
Continuing our #Android 5.0, #Lollipop rollout: Xperia Z3 Dual, Xperia Z1, Xperia Z1 Compact & Xperia Z Ultra... http://t.co/LkKkYFBPHL
— Sony Xperia News (@SonyMobileNews) April 13, 2015
Keep in mind that these are phones that have been about as early as September 2013 so they're well outside the standard 18 month range, and Sony has said the plain ol' Xperia Z (released Feb 2013) will get the update too.
We've updated our 'firmware update' database page accordingly. Now, it's a rollout - meaning that it may not happen instantly (our good friend +Mark Lastiwka hadn't received it yet, but is eagerly awaiting).