TK has responded to my thread on the TW forums again, he's made an (almost) certain statement that there will be no further PC updates:
Zola25,
Thanks, but the game is over 7 years old, so there should be no reasonable expectation for a patch at this point.
We'd love to be able to do more updates, but we simply do not have the resources to do them at the moment. If you need a clear "yes" or "no" answer instead of "maybe", then it has to be "no". That way, any update we do would be a bonus, and no one is disappointed if we never do another update.
Thanks!
Although this is disappointing it's hardly surprising, and at least we know where the series stands. Hopefully nVidia's next driver will help, which then leaves the lack of AI using countermeasures pods as the worst outstanding bug IMO.