Sweet - I hope the devs remember to remove the home and back buttons from the screen as 99% of users have capacative buttons/physical
Needs to be 100% really, especially in the phone market where it doesnt just require upgrading something inside, it requires a replacement phone. Software for phones (to be sucessful) need to run on all phones that support that OS. Granted there are certain exceptions, i.e Maps that rotate based on your world orientation needs an iPhone 3Gs or later, but these are things that the app can not do without and its just an advancement in technology.
Back buttons and home buttons will need to stay on apps, unless of course 100% of phones have physical back and home buttons otherwise the app maker is nedlessley denying 1/100 of the market.