Apple released Beta 1 of Catalina 10.15.5 yesterday. I installed it on my Developer Beta SSD. Everything still seems to be snappy. I don’t know if there are any new features, nothing jumped out at me. There are supposed to be bug fixes in this release which is good because the 10.15.4 release of Catalina is pretty buggy. Maybe the 10.15.5 release will finally fix some of the Finder problems, we will see.