I also would love to know if this patch is save game compatible.
Yes it worked fine for me as well as several friends I asked on steam.
The details: I updated the game, I loaded my last same game (in the top right it shows you the version), the game asked me if I wanted to load with an updated module, I clicked yes and loaded into the game. To see if I was actually playing the updated version, I saved it again and now when I load my save in the top right it shows e1.0.1.