Like Connor said, the Beaglebone Black system supports more than just the BeagleBone Black. I actively merge in support for Beaglebone-derived boards, so if there are issues, don't hesitate to file bugs on Github. I usually can guess the problem and just need someone to test out my change when I don't have the physical hardware.
Also, the BBGW's WiFi module (TI WL1835MOD) appears to work fine with the latest images. I'm using that module on a work project, so I'll be supporting it better than other wifi modules in the near-term. I have no plans for Bluetooth support, though. There has been some community interest in an Elixir BLE package for Nerves. For regular Bluetooth, people have been creating custom Nerves systems with Bluez enabled.