Hopefully you get the upgraded footpads. All things considered, I think the frame, battery, and electronics are all the same, so it's my prediction that the OW+ pads will be retro-compatible. Considering the V1 pads have been OOS for awhile now, I think they discontinued them in favor of the new hotness.
Just FYI, the OW V1 is now available for sale at the Black Friday discounted price of $1299. Menu>Shop>OneWheel.
I understand your pain about your purchasing situation, I've been in that situation before and I see a lot of people on this forum who are feeling the same way after this announcement. I remember when DJI dropped the price on the Inspire 1 $1000, completely devaluing all existing Inspire 1s in the wild by a third (including mine). But, so is life when you're a tech-geek living on the cutting edge of fun and games. "Apple-itis" is a real drag, but you can learn to offset the feelings of resentment toward the company with comfort in the experiences you had with the device while it was top-dog, and the capabilities it gave you during that time which otherwise wouldn't have been accessible to you. There will ALWAYS be a next-best-thing in every category, and if you get caught up in feeling screwed over every time you're going to have a bad go and all these 'stuff and things' become a rollercoaster of fear, patience, anger, and bliss. It's just money. Ya, it's a substantial chunk of change, but there shouldn't be any reason a OW bankrupts you or ruins your financial stability. If it does, there are bigger life issues afoot. I just find ways to save in other areas of life to offset the costs, it's just prioritization. I now try to think of it as trading money for experiences. In another year when OW++ Extended Range Super Duper Staminacore Anti-Grav No Flats V3 comes out and you pre-order, I'll still have my OW+ and there's absolutely no reason it shouldn't be just as fun or usable as the day I receive it.
Wait, I'm rambling, what were we talking about? Oh, ya, the new motor might be more energy efficient, but if that was the case I would expect the advertised stats to pad that range stat a bit higher, and it would look something like "5-9 miles." That's assuming the higher range estimate is the most efficient possible result. No way of knowing at this point, time will tell...