Impressed by all the new accessibility features! Guided Access seems like it will be hugely useful for both parents and professionals working with children with autism - in addition to the example from the keynote of administering tests on the iPad.
A big yes! As a father of an autistic child, the first thing I actually cheered for was being able to lock out the home button! Such a simple thing will make a big difference. I haven't even spent much time looking at the other features under Guided Access yet.