I'm disappointed, I thought it would be for all iPhones. I have a 4S and an iPad 3, and I do get regular crashes (goes back to white Apple logo and resets) throughout the day. OSXdaily had warned users not to upgrade until fixes were released, but I was way too excited to wait any longer - I can put up with it for a while, as the rest is just pure bliss, but it's annoying.
Answer: Backup your phone/iPad to icloud and do a RESTORE.
This will resolve your issue.