And its back up......
Or not! Still having issues with new 8th gen iPads. They can't contact the iCloud login servers.
Apples status page (www.apple.com/support/systemstatus/) is all full of green goodness including iCloud sign in. (A note helpfully boasts Issues have been resolved!)
Apples support drones have no idea whats going on and can only offer the less than helpful advice 'try it again in a few days'. It is possible to get into your new shiny without using an iCloud login. But no new App store toys or cloud storage (or anything cloudy from Apple) till they fix it.