I jailbroke my iPod touch on 7.1 beta 2...and I couldn't even find the .plist in iOS 7 for enabling the Battery Percentage. What I did find though is that all the devices have each others Dynamic Wallpapers...they just aren't enabled for whatever reason. I would have loved to have the Blue, Green, and Yellow ones from the iPhone release of 7.0
Interesting... Maybe we'll figure it out. I jailbroke to. The walls you were asking for earlier are in there (the color matched dotted ones) and the red exclusive is on all devices as well, just hidden. Var>Stash>Wallpaper
Where did you find the dynamics?