Activision thinking of charging subscription fee for Guitar Hero?

There's an interesting tidbit over at IGN. At the bottom of one of their articles on the Xbox 360 version of Guitar Hero: World Tour, you'll notice a little blurb with an asterisk. It reads: "*Online gameplay is only available for the Xbox 360 video game and entertainment system from Microsoft, PlayStation 3 computer entertainment system and Wii and may require an additional subscription." Subscription?

Part of us thinks this ties into the whole music-sharing thing that was revealed during GC 2008. Remember, there Activision commented on paying for the ability to upload more of your own custom tracks. So, is this something to do with that? Or, are Wii owners going to need to pay a bit extra? We're thinking it'll have something to do with the music creation, but until we hear definitive word, this one's going to be left open for debate.

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[Thanks, Robert!]