A way to pipe in commentary. Like, Riot has given us the choice between watching a game using the client (and having a much better visual experience) or watching a stream/commentary of the match at the awful resolutions generally found with that medium. Integrating some sort of VoIP into the client probably would have been too much work for this patch (Especially seeing as how we were supposed to get Varus, too, and that obviously happened..) but it seems like something that SHOULD be implemented.

Basically, put in an option to allow some spectator slots to act as 'commentators' for the match.

Personally, I would like the feature to search for particular players, or sort by average Elo in a game.