This new functionality was announced by Google, where they claim that one is able to access public transit directions through the simple act of saying, “Okay, Glass, get directions to”, and it will get to work right away, opening up the directions “app.” The default setting would be to make use of the directions type which was last used. Take for instance, if you previously made a search for directions by car, it will then offer the new directions to the spoken intended destination with the assumption that you will be driving this time around as well. Right now, Google does have public transit data for cities on almost all continents, with nearly every major European and North American cities falling under such purview.
Sounds like a killer app for those who are always traveling abroad, no?