i don't know about months:
We’ve made some decent progress with the iPhone 3G, nothing worthy of a party as yet but we are moving along nicely, we’ll keep you updated on this.
and just a heads up:
Update warning!
Now for something a bit more serious, we’ve explained about Apple’s updates in the past and we’ve warned against the immediate installation of these updates without knowing what they do to your device.
This is indeed true of the iPhone 3G’s upcoming 2.2 release. Installing ‘2.2’ on the iPhone 3G could affect your chances of any software unlock in the near future (should one be found and released), so when you see an update in iTunes await our instructions first!
dev team blog