Metris does come in a window van version with 8 person seating. Haven't seen it in person, but I'd guess it's not as plush as many seem to want in a minivan.
If load in height is better, meaning lower, on the NV200, it must be only marginally so. To me, the floor height seemed comparable between Promaster City, Transit Connect (both old & new), & NV200. OK, just looked it up & it appears the NV200 beats the TC, but by less than an inch. Had a Promaster City next to my '10 TC & the floor height seems similar. Old TC has more interior height than Promaster City & much more than newer TC. This mattered to me because you could actually have storage on floor, platform above (in my case for the dogs), & still suspend things from the roof inside. I could, with an intricate, jigsaw puzzle approach, get everything inside the older TC. It could also serve as a weekender camper van. Though that assumes you don't have a pack of large hounds, like me. lol What BF cared most about is that we could fit a motorcycle inside. I would only care about that if I broke down & had to bring it in for service.
FWD with electric RWD, hmmm. It certainly has possibilities. For most driving I'd prefer that, but not sure if it's better for towing a trailer. Then again, more clearance without having to go full on, jacked up 4x4 would suite my purposes much better. Look forward to them doing that & giving it a try.