It would be fun to have an arena with all the experimental and late-late-war planes (like the F7F, F8F). But, I doubt HTC would take the time to do it for a couple of reasons. First, if it is not as popular as the main arena or Tour of Duty, then they are better off using limited resource to do the things that contribute to those areas. Second, if it were as popular or more popular than the regular areas, that wouldn't be good, in my opinion -- it would then reduce the player base for the portion of the game focusing on the planes that were mostly used in WWII.
This would be the sort of thing that would be awesome to add once they run out of fixes and good ideas for enhancements to the regular areas.