It seems silly to describe the "new features" that have been added to Guitar Hero: Warriors of Rock without acknowledging the basic stuff the franchise still doesn't get right. For example, do you want to see the difficulty of a song before jumping into it in campaign mode? Nope, you can't do that. Want to filter and sort songs by multiple criteria? Forget about it. Compared to Rock Band 3's feature set -- keyboard, vocal harmonies, "Pro" mode -- it's clear that Activision has been surpassed. But maybe all you want from Guitar Hero is a "story" and the ability to bust through the five-star ranking system. 32x multiplier and 60 stars, YEAH!!!
You could argue that Warriors of Rock isn't regressive; it's an homage to the franchise's origins, a celebration of hardcore guitar music. The 90 songs included on the disc support drums and vocals, but it's clear what the focus of the game is: being a guitar hero. If the franchise's penchant for crazy note maps hasn't satiated your strumming skills, you'll be glad to know that Warriors of Rock ups the ante by including the entirety of Rush's "2112" -- as a boss, of course.
Final boss? Yes, Warriors of Rock's big new feature is a Quest Mode, narrated by KISS' Gene Simmons. While I could rant about how it feels like it was written by (and for) twelve year old boys, I'll let Activision do the work. The fact sheet describes it as a "journey from the infamous stage of CBGBs to the molten lava fields of rock treachery ... to help the Demi-God of Rock take down 'The Beast' and save rock 'n roll." Tim Schafer would be rolling in his grave (if he were dead).