Microsoft may have slipped up and accidentally revealed a mysterious new smartphone dubbed the Lumia Phone X via its China unit. Not much is known about the handset as of now, but speculation suggests it might be the long-rumored Surface Phone.

The device came to light after a video was posted on the Microsoft China website. The content of the video itself is nothing new, as it’s just an ad explaining how Continuum works. The interesting part comes in the description where it mentions the Lumia Phone X as one of 3 devices along with the Lumia 950/XL and Acer Jade Primo which support the feature.

Microsoft has since edited the text and removed all reference to the new device. GSM Arena suggests the smartphone could be launched in 2017, since a recent report had hinted that the Lumia 650 may be the first and only entry for the series in 2016. The mid-ranger may be unveiled on February 1 via a blog post rather than a full-blown event.

Also See: Microsoft Surface Pro 4, Pro 3 unveiled in India

Furthermore, the Lumia 750 and 850 have apparently been cancelled, contrary to reports that claimed the two would be outed during the next session of the Mobile World Congress. However, the Surface Phone is still on track, which makes the Lumia Phone X a likely candidate as an alternate name for the offering.

The Surface Phone is supposed to be revealed within the second half of 2016. It may have shown up at a browser benchmarking site a few months ago. The listing doesn’t reveal much in terms of specs, except that it runs on Windows 10 Mobile and had scored 401 out of 555 points in its test.

Stay tuned for more information on the Lumia Phone X.