BGR has found traces that suggest that Apple is testing OS 3.1.3, a minor bug fix release, and OS 4.0, which will have to be a monumental release to keep up with Android and Googles new Nexus.
There is still 6 months until the expected release of 4.0 and the new iPhone and we will keep you updated of any updates.
As always, when the 3.1.3 update hits down, all jailbreakers are reminded NOT to update until the Dev-Team confirm it is safe to do so or release the necessary tools.