Apple has released a beta for iOS 6.1.1 for iPhone, iPad, iPad mini, and iPod touch to developers. The beta is available at developer.apple.com. Make sure to download the correct version for your device(s).
Seeing an x.1.1 beta does seem a little out-of-the-ordinary, especially when there aren't any show-stopper level bugs gaining wide spread attention in the just-released iOS 6.1 but according to numerous supports, Maps in Japan are getting a lot of attention and that could require some testing before release.
Any developer playing around with the evasi0n jailbreak, who wants to continue playing around with it, should, of course, avoid any software updates, beta or otherwise, for now.