Which devices can run iOS 8? Has Apple released a list of which devices are capable of running iOS 8?
It's at the bottom of the public iOS 8 page where it states the 10 models of hardware to be supported:


iPhone 4s, iPhone 5, iPhone 5c and iPhone 5s
iPad 2, iPad with Retina display, iPad Air
iPad Mini and iPad Mini with Retina display
iPod Touch (5th Generation)