Microsoft’s Surface hardware press event is just a few weeks away from kicking off on October 2 in New York City. As the time to the event closes, it is becoming more likely the Surface Pro 7 and Surface Laptop 3 will be announced. It also seems Microsoft may has some surprises up its sleeve.

One of those surprises may be the Surface Centaurus folding laptop device. However, there could also be an announcement regarding a vague Project S.

Unfortunately, now a lot is known about this, but Microsoft watcher WalkingCat said on Twitter Microsoft is developing Project S and could introduce it at the Surface event. The reason for that speculation is because Project S looks to be part of Microsoft’s Surface division.

Some observers suggested this could be Microsoft’s Santorini Windows 10 development. Santorini will reportedly be a flavor of the long-hinted Windows Core OS that adapts to a number of different device types. It appears to be something of a ChromeOS competitor, simplifying things in comparison to Windows 10.

Unrelated

If you’re unfamiliar with Windows Core OS (WCOS), it is a modular version of Windows 10. By creating a modular Windows experience, Microsoft can put the full power of Windows 10 on any device. WCOS will provide Microsoft with a platform that will work on mobile devices and PCs alike.

WalkingCat believes Project S is not related to Santorini:

“Possibly. But IIRC Santorini is said to be the code name for new UI experience? while “Project S” looks to be a device, so, no idea,” the tweet reads.

Microsoft has offered nothing official on Project S. Whether it is far enough along in development to be announced next month remains to be seen.