I have tons of ideas wich come frome a spoiled console gamer!
What do you think about a friendlist and the ability to see what everyone is playing?
I think it would be cool if you could upload screenshots directly to a forum and discuss the game, asking for help for a game and all with an onscreen keyboard wich you can use with the gamepad.
And a notification when updates are aviable and maybe download them and install them via the press of a button…
Also fanmade achievements for retrogames would be kinda cool too!