as an ‘engineering-problem-to-be-solved’ – mountain-bikes are done.
most stuff works, and works well.
don’t like product X? – just use product Y. it’s half the price anyway.
i’m sure that shimano are working on a new 11-speed system, and specialized are working on yet another version of the enduro, and rockshox are working on a new 12mm thru-axle system, and etc.
but really, most ‘changes’ these days are just guff.
there are a couple of things i’d like to see, but they’re just tweaks really.
example: cheap through axle forks from Rockshox, steel stanchions are fine by me, basic damping is fine by me, but QR’s belong on road bikes.