Well, we know that there WILL be an update before the UK release.
This is because there are options such as the international keyboard swapping that is not currently present in the 1.1.1 release.
Apple is certain to break the TIFF vulnerability as it by definition is a bug, however the issue here is that with Apple's latest lawsuit, breaking the downgrade->upgrade path would be a MAJOR no-no for them, as they have already been accused of intentionally breaking compatibility for no reason other than to keep the platform closed at the expense of their end users.
They COULD however change the "Restore" method to completely erase the full filesystem prior to restoring, which COULD be seen as a legitimate change in order to "help out" end users whose devices were damaged by upgrading and having some resources in an unrecognized state.
There is nothing that we could do to protect against that one, though.
We COULD manually upgrade the key system files with AppTapp or even directly with SFTP access, at which point we could keep running our Applications all the while getting Apple's enhancements.
This would really be no different than what the "community" does with the PSP.