i just was on yamaha's website and watched some youtube videos of the new 2012 wr450f. the thing looks and sounds sweet! i have a 2010 yz450f right now and love it, but do wish it were slimmer. i hear the wr450f uses the yz250f frame? it looks looks like they just shoved the old 5-valve motor in the new yz250f frame, with beefier suspension and FI. do you guys think the 2013 yz450f will finally see a slimmer design? mayb different motor? i doubt the motor will change but with pros wanting slimmer bikes and the wr usin the 250f frame i am startin to think mayb yamaha will finally slim it down some? what does everyone else think?