Glass isn't a watch
Look at that interface. Clock homescreen. Voice controlled. Simple touch interaction. Small, neat and tidy.
It could have so easily been a watch.
Instead, Google seem to be trying to leap over the whole watch paradigm and go straight to the next level. Very bold.
On a side note, I can't wait until they figure out a way to get something like The Leap into this. Remember how you used to hold up your index fingers and thumbs like a photo frame? Click!