I saw this photo in a Trek fan Facebook group, and grabbed a screenshot. According to another poster in the Cyclocross and Gravel sub forum, it launches this Friday and might have clearance for 38mm tires. I can’t confirm anything about it, or even that it is a Domane at all. BUT...
-It’s not a Madone or Emonda.
-The color scheme matches already-launched 2020 Domane+ ebike.
