On Geohot’s twitter account he reports that he is not yet working on the next jailbreak for iOS 4 as of yet.
In Berlin where there are no Apple stores. USA in world cup! No plans for new jailbreak. Stop asking. -Geohot via Twitter
The recent news of a jailbreak that might have been coming to iOS 4 came from his presentation at Nuit Du Hack in Paris. Well, here’s to hoping that he will work on the jailbreak for iOS 4 on the iPhone 4 soon, so stop bothering him!