The DevTeam said many times before that Apple cannot the bug they’ve exploited in PwnageTool unless they change the hardware, which is impossible until the next iPhones come out. While this is still true, Apple managed to have iTunes 8 detect and prevent the Pwnage exploit.
But hey, this is not gonna stop the DevTeam:
The nice thing about iTunes decisions is that we can provide you with patches to counter them. We have one such patch already for Mac iTunes 8 for iPod touch. We’ll be working out the full suite of patches for all the combinations over the next week.