The FD-R9250 is Shimano's new 12 speed Di2 Front Derailleur, to be used with the semi-wireless R9250 groupset.
Wireless, but wired
Twelve-speed Di2 components are wireless, so what is a wire doing here? The new Di2 system is only semi-wireless, meaning that the derailleurs are still plugged into the battery, but the shifters send their shift commands wirelessly.
This front derailleur is meant to be used with a 12-speed rear derailleur. Just like when Di2 made the jump from 10 speed to 11 speed, this new front derailleur won't work with older 11-speed derailleurs. It'll only work with other 12-speed Di2 components, and a number of older TT/Triathlon shifters.
Want to know more about 11-speed and 12-speed compatibility? Read my guide on 12-speed compatibility.