No further details on their new escapement that’s in development, but @GreubelForsey looks like they’re employing 3D printing technology on a micro scale
,https://twitter.com/UnderTheLoupe/status/941721544987852800/photo/1
Redirecting to http://watchesbysjx.com/2017/12/greubel-forsey-reveals-ultra-efficient-micro-sized-lightning-seconds.html