I guess they weren't joking https://mail.google.com/mail/help/motion.html

piyush_soni · on Oct 2, 2013

Wow! :) ... I remember this April fool joke. Cool how it comes true now :)

dchichkov · on Oct 3, 2013

Haha :)... There was also a reply from the company. On the same day too: http://www.youtube.com/watch?v=Wq1FM84uAck

Looking forward to controlling my living room with gestures :)

ronilan · on Oct 3, 2013

People try to get human support at Google. They wave their hands in frustration and... Boom. Magic! :)