We reported last week the wording in Activisions press release for Guitar Hero world tour. (check it here) that seemed to allude to a fee for online play.  Activision has changed that paragraph a little.

*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.

It seems now that paying only has to do with DLC content. This makes me feel a lot happier about the game.