Hi Tom,
There is a 3.5mm audio output and an SPDIF output.
You cannot install a Debian install standalone quite easily, but it’s easy to disable Kodi on Vero 2 if you wish to use it for headless purposes. You also have apt-get (full access to Debian repositories) in OSMC.
Yes. You just add ‘blacklist r8189es’ to /etc/modules.
You can get 1A. If you need more power (for multiple devices), you can get a beefier adapter, or use a powered USB hub.
There is an Android NAND release which @DBMandrake and I have used. The plan long term is for an SD card release.
Please see this thread, it hasn’t been tested much.
I am watching this thread and may package Chromium as an OSMC App in the future.
Hope this clears things up and you enjoy the device
Sam