Update: T-Mobile has made a mention of Android 4.4.3 for the Nexus 4 as well. This update should move the handset up to build version KTU84L and weighs 91.7 MB.

Nexus4

T-Mobile has announced that the Android 4.4.3 OTA software update for Nexus 5s and 2013 Nexus 7s is due out starting today. According to information on T-Mobile's support page, the update will bump smartphone owners up to version KTU84M following a 77.9MB download. Nexus 7 owners will jump to version KTU84L after downloading and installing 91.7 MB of data.

Nexus5

Nexus7

Bug fix releases aren't typically the most exciting, but this one has Android users waiting anxiously. It should fix a number of bugs found on these two Nexus devices, some of which we've detailed in the past. These include improvements to camera focus speeds, fixes for data dropout issues, and patches of code that should cut down on the number of random reboots. Not everyone experiences these bugs, so the excitement for this update will vary according to how much of a hard time your Nexus has provided thus far.

Hopefully this time fares better than when Sprint announced the Android 4.4.3 OTA nearly two months ago, only to later take down the suggestion that the update was on its way.

Sources: T-Mobile [1], [2], [3]