New? Nothing that I can tell. Most likely bug fixes and usability, which is the norm on a minor release...
I specifically find touchscreen PDAs (and now BBs) difficult to work with. I tend to send lengthy e-mails (as opposed to "OK" or "Yes") and simply find that I am not effective on touchscreens (read: iPhone and Storm).
I use a Bold and am very happy with a real (rather than virtual) keyboard. It is a preference. I keep a Bold, 8220 Flip and Storm so that people can try them out and make their own decisions.
If we take the cycle between the leak of .75/.76 and its official release, .83 should be released in a week or so. As the .75/.76 release has made the Storm quite workable, I, for one, can wait until the official release. SUggest you do the same. It is better for your blood pressure. 73