I'd like an online deathmatch mode. This could be airwings only, but i have to say that I really enjoyed the multiplayer in Star Fox Assault. I wouldn't mind seing an improved version of that online. And yes this includes Landmasters and on foot sections.
While the main focus should be on classic on rails Star Fox, I still think on foot sections, Ladmaster etc could all be great additions to Star Fox. It just needs to be implemented well. Kid Icarus Uprising, to me at least, showed the 2 can be combined perfectly fine. I think that's the only way Star Fox can ever grow to be a truly big franchise for Nintendo. They can keep Sin and Punishment as their pure on rails shooter franchise. It's the better franchise anyway.
Also, lots of different paths to unlock new levels. And hopefully the game is longer than the previous ones. They do tend to be very short.
Spending warm summer days indoors
Writing frightening verse
To a buck-toothed girl in Luxembourg
NES, SNES, N64, GC, Wii, WiiU, GB, GBC, GBA, DS, 3DS, Mega Drive, Game Gear, PS1, PS2, PSP, XBOX 360, Atari Lynx
