We can now confirm that the new 8GB iPod touch is not vulnerable to 24Kpwn. It took just 6 bytes for Apple to fix this:
load_module+16 43 68 LDR R3, [R0,#bdevImg.totalSize]
load_module+18 9A 42 CMP bufsize, R3
load_module+1A 13 D3 BCC FAIL
Given how small the fix is, it seems likely that it was also applied to that updated bootrom of very recent iPhone 3GS devices. We'll be able to confirm this once we have an actual one of those in hand.
find_named_image(illb): 000100d8 00024100 696c6c62 696d6733
dataSize totalSize illb img3
Update #2 10/17/2009
Confirmation that the new 8GB iPod touch is at least a tethered jailbreak. This device doesn't require personalized img3 files in the way that the iPhone 3GS and iPod touch 3G do. For this reason, it will “always” be jailbreakable (no need to rush and get your ECID signed hashes like you do for the 3GS and ipt3G). But for the foreseeable future, it will be a tethered jailbreak only.