One bike at the Tokyo Motor Show that is being talked about is Yamaha's R25!
I bet this thing would be so much fun on the track! 249cc parallel twin!!! Fugg yeah!
[ame="http://www.youtube.com/watch?v=ck3M0BumS4I#t=40"]R25 / The 43rd Tokyo Motor Show YAMAHA 2013 - YouTube[/ame]