The Fr site says 'poids plume' 11Kg or about 22lb.

I doubt hub makers will produce a 3 speed hub just for the strida half fork (btw does that type of fork have a name). Perhaps the new strida will permit a 2 speed BB.

I wonder if you can stand on the strida 5 pedals?

Looks like the same plastic main gear as the iXi, http://www.ixibike.com/.

What would be neat is if they could adapt the iXi belt drive for the brompton.