Whatever it is they end up doing, i just hope they don't sacrifice that which made Lumias special - color options, durability, killer cameras, Qi charging, and something that feels good to hold. I own a Surface 3 and love the device, but when holding the it, I often find myself wishing its sides were rounded or tapered (like those on the Lumia 2520, or even the iPad). Maximum functionality and user-friendly design were what set the Window mobile experience apart. I hope this isn't lost on the Panos led Device team. Primarily, however, what makes the Surface line revolutionary is the stand. If the stand can be incorporated into the design without compromising the functionality Lumias have been known for, the Surface Phone would be an absolute knock out. And if that can't be done, I hope an alternative device is provided.
Full disclosure: My dream phone would be the Lumia 950 XL if it were shaped like a Lumia 735 (or the Lumia 735 with 950 XL specs). The only interest I would really have in a Surface-branded phone is how it might help draw positive attention to the Windows mobile platform.