Hmm, this article seems to imply something different regarding Sky's Ultra HD content:
http://www.t3.com/news/sky-q-ultra-hd-here
Quote:
“Firstly, it's not like it was with Sky Sports HD, or even Sky Sports 3D. There's no separate channel for Ultra HD content.
When you tune into a channel with a live programme available in Ultra HD a prompt will appear on screen. Select the prompt and you’ll be taken directly to the Ultra HD live broadcast. You can change between watching the HD and Ultra HD broadcast at any time through the Mini Guide.
To watch sports live or find sports coming up over the next seven days, go to the Sky Sports Home Page, select Ultra HD and you can tune in live or book a recording.”
I guess the Ultra HD 'Channel' will be a hidden one then, with the Red Button taking you to it whenever you the regular program. Which implies they could set up a channel per event - if there's multiple ones going.
Also, the Article seems to imply that unlike BT's 4k box - it won't let you downscale the 4k content to 1080p like you can with BT's box:
Quote:
“You will need to set your box resolution to 2160p (4K Ultra HD) rather than 1080p (Full HD). There will be a box update towards the end of July and you can do the set up any time after that – simply go to Settings > Setup > Audio Visual > and select 2160p. If you do not set up you will be prompted to do it when when you attempt to view in Ultra HD - press the red button and follow the on screen instructions.”
Although having said that, on my BT box I have it explicitly set to output at 4k resolution - however as i've only got a 1080p display connected, the box just overrides that and downscales to 1080p anyway - so you never know...
That 2nd quote could be marketing fluff as BT also imply you can only watch their 4k channel if you have a 4k TV, but actually it will downscale to 1080p50 - they just keep that quiet ha.