Just seen one of these in Curry's and was impressed with the size of it....
I'm thinking it may fit using some kind of RAM mount... it has a standard screw mount point on the bottom of the waterproof case....
Wifi allows you to check the mounting by viewing what the camera is seeing on your phone etc.
£229 in Curry's... £206 from Amazon.....
Never dipped into having a video on the bike before...
http://www.google.co.uk/url?sa=t&rct=j&q=sony%20hdr%20as15%20review&source=web&cd=1&ved=0CDoQFjAA&url=http%3A%2F%2Fwww.engadget.com%2F2012%2F11%2F05%2Fsony-action-cam-review%2F&ei=F6_SUerJAo370gWyr4CwDg&usg=AFQjCNF23DNHp2b0qa9LrGbF_dCkEWgGog&bvm=bv.48572450,d.d2k
That looks an ok HD camera. You'll find if you get one for the bike it will introduce you to a new hobby, video editing and all the joys that that has to offer.