It is out! Accually for awhile...but I have some info on it! It isn't an "amazing game" like guitar hero 3. It pretty much is much easier than guitar hero 3. Don't get it unless:
1. You are new to the guitar hero franchise
2. You are not very good at guitar hero
3. You are a die hard Aerosmith fan
Now here is a little description.
Guitar Hero: Aerosmith puts players in the shoes of Perry (guitar), Whitford (guitar) and Hamilton (bass)as they rock out alongside frontman Tyler and drummer Kramer. Gamers experience Aerosmith's legendary career, from their first gig to becoming rock royalty.
As players progress through the game, they can rock out to scores of Aerosmith's greatest hits, as well as songs from celebrated artists that the band has either performed with or has been inspired by in some way. Venues from historical moments during the band's illustrious career offer the experience of "sweet emotion" and further capture the essence of the band’s rise to fame.
I'll try to get the setlist later! So I would give this game a 7.4.