The Sony Xperia Tablet Z has received new firmware updates over the last week. Sony has pushed out firmware build 10.1.1.A.1.307 for the LTE model (SGP321) along with version 10.1.C.0.370 for the Wi-Fi models (SGP311/SGP312).
Users are reporting a number of small performance improvements to the home launcher and touch sensitivity. Some are also reporting better Wi-Fi performance. Those who have their tablets rooted will be glad to hear that root status is retained after updating.
Thanks Quynh and Rene!