Because waiting til next week is just awful. I havn't been able to play the game at all since the last patch and expansion without the entire program crashing. It would be real nice to see if you fixed any of what I was experiencing, and not have to wait yet another week to play the content I just paid for.
All I saw there (and I checked again) is the thread "For those of you where saving doesn't create a save file!" Which only has hotfix_test3 or whatever the file is.. which I've downloaded already in the past, its been posted for quite some time. I just saw the patch announcement and had assumed there was something new.
Hotfix 10c is the latest. Its located right at the very top of this topic: http://community.gaslampgames.com/threads/the-current-bugs-thread.4118/ It fixes tons of things. I have had no big problems using it, while vanilla was unplayable.