The Network has shown up on Apple TV for me. other Apple TV users may need to restart Apple TV to have it show up. Sign in gives you two options, you can sign in with your WWE account or sign up thru the iTunes store, however, if you sign up through the iTunes store you have to pony up the $59.99 right away in full. The network looks beautiful on Apple TV and the interface is uniform with other Apple TV apps like HBO, Netflix, Hulu Plus looks simply beautiful.
ORIGINAL: According to prowrestling.net, while there had been concerns over availability, the WWE Network is compatible with both the Chromecast and Apple TV.