So it's not UTFT that has been updated, but a new library called Utouch, which replace ITDB Touch.
I've tried it and didn't notice much difference but one problem: I ran the calibration program, used a stylus and took my time to press at the center of those squares, and once the resulting values were added to that header file, the touchscreen was not accurate at all, while the previous version gave good results. I made sure the orientation was correct, re-ran the calibration twice, same problem. So I'm using the default values since they are hopefully more accurate!