Apple just released iOS 7.1 beta 4, few hours ago. It bring minor UI tweaks, added option to change gender for English UK users and many more stability improvements.
But one thing more that apple patched with iOS 7.1 beta 4 is patching the jailbreak exploits. The popular jailbreak tool Evasi0n7 which was released exactly one month ago has been patched. Earlier Apple seeded iOS 7.1 beta 3 two weeksago but that didn’t patched the jailbreak, but this one patches it.
But now iOS 7.1 beta 4 has patched the jailbreak so when iOS 7.1 will be released to public it will come with patches. Users who want to jailbreak should avoid the update. In future if you want to jailbreak your device then avoid this update and jailbreak now. if you want to jailbreak now, you can follow this tutorial, to jailbreak your iOS 7 device.