Hey Garthex! Thanks for checking out our app - Rover does support BART (with real-time arrival data), try routing to SFO for example. Let me know if that doesn't work for you - we'll investigate if something is not looking right!
I've generally had success (and love the app due to the user experience and integrated nextbus functionality) but I was getting a message "Rover only works for SF MUNI right now." a few times for a particular route between Berkeley and SF. So at the very least, that text should get changed.
Also, the headline seems wrong since it doesn't seem to support some transit options such as AC Transit. Although, likely the spirit of the headline is that it supports "all" kinds of transit options such as buses, Uber, and bike sharing, but I'm sure that is also incorrect (i.e. does it include ferries? cable cars? private planes? hot air balloons?)
Edit: Actually AC Transit is East Bay and the headline says SF options (rather than SF Bay Area options), so the headline isn't wrong because of that.