It may be too early to tell, but what are the odds that the ist front bumper cover will fit the xD. Design wise, Toyota USA dropped the ball on this one.
The one thing leading me to believe it might fit is the fact that the length of the ist/xD are identical. Just hoping.

prolly will have core bumper supports you have to cut or sumptin

you have to for the bB for JDM kits

I would imagine it would be a 95% bolt on swap, but it's hard to tell if there's an extra bumper crash bar stuffed under the USDM xD bumper or not, when compared to the iST.

http://blogs.cars.com/photos/uncategorized/scionxd2.jpg

http://car.nifty.com/cms_image/car/2/070730145417/07.jpg