Not letting T-Mobile subscribers have all the fun, Google has released the factory image and binaries for Android 4.4.3 today. These tools apply to the Nexus 5, Nexus 7 (2013) and WiFi Nexus 10, Nexus 4 and WiFi Nexus 7 (2012) models.
Outside of T-Mobile’s posting, there haven’t been any additional over-the-air update references for Android 4.4.3, however those who wish to manually flash their Nexus device can now do so. Just make sure that you’re completely comfortable manually installing software on your smartphone or tablet before trying such a thing. If not, we highly recommend waiting for an over-the-air software update, which shouldn’t be too far away.