Apple has stopped signing iOS 8.1.2 meaning that it is no longer possible to restore to the firmware version to jailbreak your iPhone, iPad, or iPod touch.
The jailbreak community is at risk of malware following a release of a proof of concept that demonstrates it's possible for a tweak to permanently brick your iPhone.
Apple has stopped signing iOS 8.1.1 beta 1 -- without releasing beta 2, indicating that an official release is imminent. Once iOS 8.1.1 is released, you will no longer be able to restore to iOS 8.1 and jailbreak your device.
Pod2g has announced that Planetbeing, MuscleNerd, and P0sixninja have joined his effort to release an untethered jailbreak of the iPhone 4S and iPad 2.