Dev Team has reinforced that they were able to jailbreak the 5th beat of iPhone 3.0 firmware. And they are pretty confident that the jailbreak will work in the final release of the iPhone 3.0 OS to be released in Apple’s WWDC event in June.
Here is what they said about the iPhone 3.0 jailbreak
As we’ve said in previous posts, nothing other than a hardware respin can prevent our jailbreak from working on all exisiting iPhone and iPod Touches.  They’ve chased our jailbreak so far down in the chain of trust, the only way they can fix it is in hardware.
In fact, I am impatiently waiting to get my hands on the rumoured new iPhone as well. Expect us to come back here in TiR with a vengeance. A site re-design is also in the making!
If you are thinking of trying out one of those hijacked versions of PwnageTool or Quickpwn for any of the beta releases of iPhone 3.0, Dev Team advises you to hold your horses.
If you care about the yellowsn0w unlock, don’t go anywhere near the beta releases. You will lose your unlock, possibly forever.
A lot of people I know who tried have reverted back to iPhone 2.x as most of the jailbreak apps and winterboard themes don’t work there anyways.
[via Dev Team]
Well people who ugrade jailbroken phones to higher firmwares before they’re broken deserve what they get. I mean why wouldn’t you wait couple weeks?