I would have to say a Music Channel.
Arcade Channel? For various new games, but there are slots for each game to have their own channel, so I imagine they will keep it like the VC games.
Oh! Trivia Channel! Or a daily channel, for example "10 years ago today"..... or
something that would show how "Today is Eat a lot of Kethcup Day" Each day has their Own Odd little thing about it. National Wear Polka Doys Day, Secretaries Day, Etc..
Where have you heard about new Channels being revealed?