Moved to General WP Discussion.
Anyways, this is fascinating news, I used to be impressed at how the 635 would distinguish between when I was running and when I was walking during my day, how watches can distinguish the specific kind of wrist rotation and wake up, etc.
On a semi-related note, I just discovered BlackBerry's Picture Passcode option and I think it's brilliant and likely immune. Not much room for error though.
https://www.youtube.com/watch?v=Gef7kehpedA (this is on BB10, but it's been ported to Android.)
Does this also require the webpage to be open under the lockscreen?