I was going to point out the BD Mercier Nano, but it looks like the dropouts aren't what you're looking for. Soma has one, but again, I'm not sure the dropouts are what you're looking for (I can't really tell on my screen, though). If nothing else, Cannondale has the Hooligan 1 model that comes with a 3spd IGH- maybe you can lace your Alfine 11 into that wheel and swap the shifter out and call it good?

Oh, and here's a bit of eye candy for you - http://www.bikeforums.net/folding-bi...s-we-like.html