It seems that Monero will not be able to fix the vulnerability in time.
I noticed today they added checkpoints in preparation for the attack:
https://github.com/monero-project/bitmoneroSo.. what does this mean? Will the checkpoints sufficiently defend against the attack?
I know that checkpoints are used to defend against a 51% attack. I would assume they could be used to secure the chain from a TW exploit as well, but I'm not 100% sure on that.
If my recent conceptual post is correct, the check points might not help because the legitimate and bad forks could be intermixed?? So you'd be unwinding legitimate transactions? I am the wrong person to ask. I have no experience with these sort of attacks. This is mostly off the top of my head in the span of a couple of hours. The anonymity issue was something I felt more qualified to delve into.
A CP means that any fork (such as a TW chain) would have to start after the CP. I don't see any way to intermix blocks of chains after a fork, but certainly TX could end up on both chains if that is what you are suggesting?
The anon issue is interesting to me as well. It would seem if rings are poisoned with known keys in order to surface a TX true endpoints, then if there are multiple non-cooperating entities doing this, it could prevent the success of either.