Talking of innovation, I'm really surprised at the low takeup of Gates belt drive by folding manufacturers. Belt drive offers even more advantages to folding users than regular users, eg clean to carry, lift and store in an apartment, maintenance-free for occasional users. The single rear stay design such as Mu has no rear triangle to break open and is suited to folder design.
Bromptons are stuck with a chain due to their fold mechanism but for everything else, belt drives should rule.