As a preface, I'm not going to be buying/building anything until my new house mortgage closes, so spring of 2016 is realistic. That aside, more speculation about what I could build for my to-be-6.5 miles each way, windy, slightly hilly commute:
I've been pretty happy with the idea of the MinUte "mid tail" as a road friendly commuter/utility bike. I could run my 700c x 47 mm tires on it, for instance. For daily commuting on gravel and bumpy dirt, however, I wanted to explore options with larger volume tires. (Full suspension is still out, as it was when I built my first commuter bike, because of ugliness, cost, and that rack/pannier options become severely compromised once it's thrown into the mix. Again, this is a bike to get me, my clothes, and my lunch to work, not a bike for some retiree to putter around on.)
One option would be a factory mid drive fat bike. There are a few now, the nicest probably the Felt:
That photo illustrates nicely that the rack situation is well taken care of with (rigid) fat bikes. Note absence of fenders, however. I guess one could rig up some motorcycle fenders, as they certainly run tires as wide as those on fat bikes, but there seem to be no good fat bike fender options that I could find. That's a deal killer for me, again as I have to show up to work clean and relatively well kempt.
Besides, I don't think 350W nominal from these legal fat bikes, mid drive or not, would actually keep me going at 20 mph with any sort of meaningful headwind or grade thrown into the mix. Maybe that'd suffice for a sleek thing like the Raleigh Misceo iE, but not for a fatbike:
(Note lack of fender clearance on that Raleigh. Also note that fatbikes with 170 or 190 mm rear dropout spacing do not lend themselves easily to hub motor conversion except with 135 mm front forks, and I don't want another front drive bike.)
Anyway, I found another possible bike, the Surly Troll. It's the little brother of the Surly Ogre that I've posted about on the last few pages of this very thread. The difference is that the Troll is 26" vs. the Ogre's 29".
Rack and fender compatibility is a go.
What's more, I could run 65 mm fatbike rims with it! and at least 2.5"-2.7" tires. 3.0" tires such as the Surly Knard effectively don't fit out back, although they fit fine in the front fork. It'd be a "half-fat bike".
That's it next to a Pugsley.
Plug that same 9C/ebikes.ca PAS kit from the MinUte idea on it along with a 25A capable frame battery from em3ev and that could be a comfortable commuter indeed...