Thank you both!
Don't get me wrong: if I had already collected the older version, I'd be upset. Even if you think the new version is 'nicer', it wouldn't be worth the pain of having split Carcassonne worlds with potential exclusives in both sets. I'm just lucky in that I can start afresh.
I decided to push my luck and ask Z-Man if any other expansions were being re-released at the same time. Will let you know if they respond!