Sony's first round of Android 4.1 Jelly Bean-based firmware has passed through certification at the PCTRB forum, a usual indicator that the update is just a few weeks away from being pushed out to handsets. Firmware for the international Xperia T and TX and the AT&T Xperia TL has passed certification, meaning those handsets should be first in line for the Sony Jelly Bean upgrade. In the case of the Xperia TL, carrier certification may lead to a slight delay, but TL owners can rest assured that the bulk of the work is done.
Late last year Sony promised to release Jelly Bean updates for the Xperia T and TX in "mid-Q1," so it looks like things are going according to schedule. If you own one of those phones, we recommend keeping an eye out for the update in mid-to-late February.