https://www.cnet.com/news/surface-pro-6-could-be-heavily-redesigned-for-2019-dual-screen-andromeda-this-year/

Microsoft's Surface Pro hasn't changed a lot in recent years. After a year-and-a-half wait, the 2017 version was primarily a spec bump, with only minimal changes to the body and Microsoft's trademark kickstand and stylus. The 2018 model merely added an optional LTE antenna for cellular connectivity.

But according to ZDNet's Mary Jo Foley, a "heavily redesigned" Surface Pro 6 could be coming in mid-2019, shaking up the formula.