I've heard that the next attempted jailbreak will be 7.0, but obviously we won't know if it can be broken until it gets here. We play the waiting game!
In the meantime, I'm keeping my 4s on 6.0 with a jailbreak.
In terms of tweaks, i recommend JellyLock or Atom for a unique lockscreen with some customizable shortcuts. Look 'em up on Cydia!