During this day evasi0n7, the solution of untethered jailbreak for iOS 7 was released to the general public, the hackers from Evad3rs surprisingly offering it before Christmas, but unfortunately with problems. It seems that evasi0n7 it was tested without saurik being involved in the development process, the creator Cydia arguing that his application could have major performance problems. In the same way, the mobilesubstrate could work incorrectly, and with it most of the tweaks from Cydia could have the same problems.
All these problems will be solved in time, but a lot of patience will be needed for everything, so for now I recommend you to wait, especially evasi0n7 does not properly jailbreak all devices, some remain in a boot loop after performing the procedure.
