Disc brakes, and their associated fancy new levers, and massive rear cassettes.
Don't get me wrong, it's all interesting stuff, I just can't see it being much use for top level racers this is intended for.
Most pro teams have a set of separate ultegra di2 long cage rds for when the riders want larger than a 28 so the demand is definitely there. Maybe not so much of a need for your average crit racer mind you.
Disc brakes, and their associated fancy new levers, and massive rear cassettes.
Don't get me wrong, it's all interesting stuff, I just can't see it being much use for top level racers this is intended for.