Please do not update if you wish to retain your jailbreak. You will not be able to downgrade back to to 7.0.6.
More details about iOS 7.1 can be found in the release notes.
For a very limited time you can still upgrade to iOS 7.0.6 by manually selecting the firmware you wish to update to. If you haven't already updated to iOS 7.0.6 we suggest you try. Instructions can be found via theiClarified Jailbreak Wizard.