It's best to stay as scifan57 said. @winocm and @ih8sn0w are essentially done with the 6.1.3/6.1.4/6.1.5 jailbreak, and are simply awaiting for the iOS 7 jailbreak to be at the final stages before releasing to see if there are any overlapping vulnerabilities that can be used.
If history were to repeat itself, there will be a doomsday time set as when Evasi0n 1.0 was released. It wouldn't be late to upgrade then considering there will not be security patches that affects the jailbreak until after the jailbreak is released.