Back in early February when Sony started pushing Jelly Bean to the Xperia T and V, it promised the same update for the TX by "the end of March." Here we are, with four days left in the month, and Sony has made good on that promise. You hear that, all other manufacturers?
At this time it's not completely clear what enhancements this brings outside of stock Jelly Bean's improvements, but it's likely similar to that of the Xperia T, V, and TL. Here's a look at that changelog: