I saw in a search that you didn't see any USB drivers in El Capitan Beta 2, has anything changed ? I have a rootless setup and get the following message at startup:
09:13:52 INFO :No drivers installed, I am installing new ones...
09:14:32 INFO :Installed driver is now version 1.0.89
09:14:32 ERROR :IOIteratorNext = 0. com_virtualhere_vhhcd is not correctly registered in the kernel, you may need to reboot