I noticed this problem too. The (stylus) keyboard will type characters all around the one I intended. Calibration doesn't help. I haven't noticed this on the thumb keyboard, but I don't use that as much as the stylus keyboard.

A related problem is that my stylus keyboard often doubles letters. The tap sensitivity seems all out of whack since my update. This causes the most problems when trying to enter a password, since I can't see doubled or mis-typed characters. The worst case was when I changed my root password and it must have done the same mis-type twice in a row, because I couldn't get back into root... Finally one time the keyboard misfired the same way again and I was able to get in and change the password to the proper one.