Note to self, check FCC before posting.
The Forerunner 935 will indeed be a round device (silly Garmin, now we have no nice square screens!). https://fccid.io/IPH-03191
This means that Appelmoessite probably does have real photos at elemnt-bolt-garmin-fr935-video after all. To me it looks identical to the FR235 so I’ve held off re-posting that particular rumour. I guess in future I ought to post everything I spot – this is a rumour site after all!