i read in one of the threads here today...
The evo will have the new touch screen sensor tech. It will be able to handle: Finger tips, finger nails, gloves, and a stylus. :d
i have also heard that the evo will have the same tempered glass technology as the hero. Believe me when i say, the hero screen is one tough screen. Very hard to scratch. Search youtube for hero screen test.
Hope this helps.. But remember.. It aint true till you see it in your hands!!!