Successfully test fit a newly acquired OEM 2015 vented windshield to my 2010 C14, so YES it does fit! Final answer. 
Let us know how it works out.
I doubt I'm the first, but I promised to report back on mine mounted on a '10 C14, so here it is.
This is the first time I've noticed an improvement in a windshield install since I tried the large Aeroflow that is in the "try a windshield for free" large group. It was almost as good as the 2015 OEM screen but I thought it was too fugly and wobbly for me. I usually ride with the windshield fully lowered and with a top X-Screen spoiler tilted forward. I find that the spoiler collects most of the bugs and keeps them off of my visor without causing any buffeting. I only raise my screen in the rain; when I've forgotten my earplugs; or when I get a phone call to help the microphone with background noise. I never have a buffeting problem with any screen when raised except in strong cross winds or when following some trucks (too closely
). My windshield problem has always been back pressure in the raised position, it's like having a passenger behind me pushing my head forward when ever I raise the screen. This one does the same when raised until I open the vent and then it is 90-95% reduced. I've tried cutting various holes and even the Madstad C14 bracket (which flowed a ton of air behind the screen) with the '10 OEM shield, but nothing helped except the Aeroflow and now the 2015 OEM shield. I just tried it on a trip to Wisconsin and it worked great for me. It is difficult to open when riding but it is possible.
The screw thread sizes are the same as the previous years, except that the socket caps all are now the same size, so only one hex wrench is needed to remove the six through mounting screws and the two cover screws. When the screen first came out I toyed with the idea of purchasing the hardware and just cutting my '10 screen to fit, but that would not have worked as the '15 screen has a significant protruding lip at the top of the vent. The screen is also thicker at the top of the mounting area, as seen in the labeled photo below. Overall the screen is the same thickness as the previous years except in the mounting area. Height and width are the same as the Gen II screens. Using the '15 screen on my '10 C14 seemed to work fine. I have the clamp on X-screen spoiler at the top so mine is even a little heavier than it would normally be. I haven't weighed it yet to compare the weight difference with the '10 OEM screen, but I'll get to that when I take it off to paint it black. I also have a dash shelf, so that may have some affect on how it works, but I wouldn't know if it is a positive or a negative affect (effect?..
I always mess that up) The vent is sized large enough to potentially let in a medium bird (a dove sized bird, but maybe not a fat pigeon) so my dash shelf should probably stop it from coming straight through unimpeded.
I purchased mine from a friend that had a black '15, so part of the cover is painted to match his bike. I may eventually get some Colorite spray cans and try my hand at rattle-canning it Candy Neptune Blue. Maybe.... someday.... maybe.
Too many photos, must be ZG's influence.
(click pic for full size)
