Knowing how hot the bush plane segment is, I suspect that one of the new designs will be a high wing, but I doubt it will be rag and tube as that's not what typical RV builders are after. I suspect it will be more like the Rans S-21 outbound where the forward part of the fuse with the engine and wing attach points will be 4130 tube, but then the back part of the fuse more standard RV construction and mated to it.
I think the bigger question is what gear, flap, and wing setup are they going to use.
Cabane-V gear is stronger, but draggy. Maule or Bearhawk gear is less draggy, but not as strong. Spring gear is faster, but it can be heavy, and if you aren't done flying or have all of the AOA out of the wing when it touches, you are going to do a double humper landing.
The flaps are interesting with the bearhawk using a standard barn door flap, cessna using a semi-fowler flap, and the husky and maule using a lower hinge point. I'd love to see a full segmented flap like the performance stol flaps.
The wing is all compromise. If it's a high lift design with lots of incidence then you will get a slow flying airplane, which is what I want. Stumps and rocks suck at 50kts. 30Kts is way better, but that same wing won't cruise at 140kts.
Another point is the size. I'm not building an RV because I want to put a campsite, bikes, and fishing gear in my airplane, then operate off of 500ft of dirt. An S-21 is a little small for this mission. A kitfox I think is even smaller. I'd love to see a bearhawk 4-pl, maule, or C-180 size airplane from Vans, but I really doubt that will happen.
Now that I'm thinking about it, if I could buy a experimental C-180 from vans with a lycoming io-540, large rear door, a Sportsman stol built into the wing, a stick, and sportier handling, then just take my money. ALL OF MY MONEY. But... it won't happen....
schu