To be honest, it's what the guys do best -- politically-rooted concept arena rock that merges classic rock'n'roll vibes with an in-your-face punk attitude. That's Green Day being true to themselves, so props to Warner for finally recognizing THAT at least. That being said, 99 Revs, as great as it plays live, isn't a branding hook that's going to grab attention for the tour. I agree with someone else's post in the GDA comments that calling it the "Wow! That's Loud Tour" would have been a little piece of awesomeness. And yeah, they'd better put THAT one on the setlist or someone's gonna be pissed. 
Hmm not sure about finally. They've been marketing them that way ever since AI came out (and when I say they I mean whoever's job it is to market them, not necessarily just Warner). That is Green Day being true to themselves, but so is making fun retro party songs. That's Green Day being true to themselves right now. It's a bit of a shame they're not brave enough to market them as today's true Green Day instead of clinging to marketing them as the AI era's Green Day. I agree on Wow! That's Loud though