See the Changelog for list of features and fixes.
SoulseekQT Public Build 4 for Mac
Not much to say here. Seems like all of the changes made for the Linux port pretty much worked right out of the box on OSX. The no proper dock icon business has been addressed. I went through all of the basics, rooms, downloads, uploads, sharing, browsing, searching. It all seems to work. If this is the first SoulseekQT build you're trying on your mac you'll need the Qt framework installed as before. Link below.