We don't have the linux build for this version finished just yet - but the good news is we just hired someone who is pretty passionate about linux, so there's good reason to think it'll be prioritized. As for app tracking, we're also rebuilding our mobile apps with this new version in mind. Unfortunately Apple prevents us from doing any app tracking on the iPhone but the android version allows for some of that.
Thanks for letting me know (:
BTW: I would love a “How it works” section on your page. I would feel more safe signing up if I knew what would be installed and why.
Ah, great point. Adding that to our design pipeline.