I have to agree with hardriven RC. Things like the 4 mag system and the V2 brushes aren't that unique. The rules really do cramp innovation. They may be unique to the rc industry, but things like this are common in the industrial motor market.
I don't know about a plastic can, but I know hacker used to make a carbon fiber canned, brushless motor for airplane racing, where a small amount of weight makes a huge difference.