https://www.techradar.com/news/microsofts-foldable-surface-device-isnt-ready-for-a-2018-launch

For a long, long time now we're been hearing rumors that Microsoft is working on a Surface Phone or mini-tablet, with the device apparently folding in half when needed. New reports suggest the hardware and the software for the compact Surface are now being reworked, with no launch expected until 2019.

That's according to sources speaking to Thurrott, sources who say Microsoft isn't happy with the quality of what they've managed to put together so far. It's not a case of going right back to the drawing board, but Microsoft is apparently taking a few steps back.