What more to add? My preferences:
-4-inch blade of substantial thickness. It should be able to pry if it needs to without any concern.
-Handle is extremely important. It should be very comfortable in virtually any position. I don't know much about handle ergonomics, but you do! So, just make sure that the operative term is VERSATILE. This knife should be your best and only friend out there, so it should be able to do as many tasks well as it possibly can. It's obvious, but it's imperative.
-Offer in both synthetic and wood handles--people like different stuff. I love desert ironwood, but just a wide selection would be good. I love knives with pretty handles.
-If it wouldn't adversely affect handle ergonomics, a nice lanyard loop/hammer at the end of the tang would be good. Pounding is sometimes very helpful out there.
-I know there will be dispute over this part, but I would like it to be a full convex grind, from the spine to the edge. One smooth curve. I have only a couple knives like that, since few make them, and I'm hooked. Their feel during cutting is generally exceptional.
-You should offer both stainless and carbon steel. I'm torn on this one--I prefer a good carbon steel any day of the week, but especially in wet climates or canoe trip, or just in general, rust can be a really big and annoying issue. Whatever you do, try to find the best steel you can in each category, in terms of versatility, ruggedness, edge retention, and overall strength.
-The sheath should be versatile, as well. I don't like Kydex very much (always scratches the finish), so I'd probably advocate leather. But whatever you do, put lots of lashin holes, loops, and any other attachment method you can conceive. I'm always a little annoyed when I have to wear the knife in a certain spot (which is normally where my backpack's hipbelt goes). Just give the sheath as many attachment options as you possibly can. Did I mention versatility?
-Remember that the tip is important, and I don't think Tanto is good in this application. A Bushcraft knife needs to be able to drill, do fine work, and also pry. Trying to find the best blend between pointy (spear, I guess) and strong (crowbar, I guess) is always tricky, but I guess vision in decisions like that is what makes a great knifemaker.
Well, I'm not sure what else to add. Make it stunningly beautiful, stunningly versatile, and stunningly rugged and strong. You'll know what to do.
Thanks for asking for our input, Dan! Good stuff, and I can't wait to see what happens here!
Chris