the following link would suggest that there will be a Queen Guitar Hero release sometime next year.
http://www.eurogamer.net/articles/guitar-hero-queen-coming-says-may
If you search, there are a number of other links carrying the same basic info, but it appears the basic info comes from a translated source that perhaps doesn't even name GH in the first place.
I'd have thought this would have been on Rock Band, if anything.
Cheers
Steven
onedunpark