A decision was made today to delay the release of Greenpois0n. iPhone 4 users will have to wait for the new jailbreak for the time being
I'm certain the decision was not made lightly and is for good reason. That reason apparently is due to the untimely limera1n jailbreak release by Geohot. Limera1n is still in beta and is only usable on Windows. The reason why Geohot's Limera1n is the root of the Greenpois0n release delay is the fact that the Limera1n tool uses a different bottom exploit than the one that was supposed to be released today based on the work of the Chronic Dev Team and the iPhone Dev Team.
The Chronic Dev Team states:
Thanks to the irresponsible antics of geohot, we will have to delay the release of greenpois0n (new ETA = as soon as possible), so that we have time to clean up his little mess and integrate the exploit he uses in limera1n into greenpois0n. This way, we can save SHAtter for future devices that may still be vulnerable to it.
We know that this is not what some people want to hear, but due to geohot needing to feed his ego (as usual) and revealing his limera1n exploit, we do not have any other responsible options.