We've known for some time that Microsoft is working on a Qualcomm-based Surface Pro, and now it's official. It's called the Surface Pro X, and it's powered by a custom Microsoft SQ1 chipset, Qualcomm's newest flagship chipset that's custom-built for PCs. It's meant to be comparable to an Intel Core i5.
The Surface Pro X is called that since it's a newer form factor, and you'll likely see next year's Intel-based models look the same. It's not dissimilar to what Apple did with the iPhone X, while still producing the iPhone 8 and 8 Plus.