Hi, I haven't heard anything about an alpha version, but just noticed that you can now sign-up for "GlassWire Mac News", if you go to glasswire.com/download/ under OS X, where it says:
GlassWire for Mac is on the way!
Join our email list to get access to our early Mac beta before anyone else.
Guess they did take note of our interest in a Mac / Linux version
Apparently "New Users" can't put links into forum posts anymore, which is why I used the short version above
funny, though, since my original post does contain a link