Surly have the new ultra hubs for 100mm front and 135mm rear. There is rim brake hub and disc brake hub.

These are lovely hubs and easily converted to Q/R skewers too. See my listing for the hubs for a more details. 

If you have a 135mm spaced frame and want to use a fixed gear cog or single speed freewheel there is not alot of hub choices out there. 

This rim brake hubset have been laced to BORG22 (Kinlin rims) with black Sapim force triple butted spokes. Stiff reliable wheels. The disc brake version needs a symmetric rim as the flange spacing for the rear hub is 36/32mm which is not enough for the BORG22 Disc rims to be used (3mm offset) but a DT Swis RR411 DB asymmetric rim can be used or the DT Swiss R460 symmetric rim. 

So for those that want a fixed gear disc brake wheelset you I now have a solution. These wheels are off to a chap in London where such things are commonplace.