If anything it's delayed the release of a jailbreak, but the combo of comex, musclenerd and planetbeing have a jailbreak and unlock working on the iPhone 4.
Being on 3.1.3.. I feel lucky. I will need a boat load of confirmation when a 4.0 JB finally comes out. I am happy with my set-up now. The only option that 3gs - on - 4.0 users have that I don't is camera zoom. I think thats it...
I have categoriesb (folders)
Proswitcher/backgrounder