A slip up by Microsoft's China headquarters left hints to fans about another possible Microsoft Lumia phone in the making, the Microsoft Lumia XL.

A video was posted by Microsoft China in Chinese website BiliBili where the pros and cons of the upcoming Windows Continuum. Under the video was a reference where Microsoft had a slip-up and mentioned the Lumia X phone possibly implying that the Redmond-based tech company will be working on a Lumia X handset soon.

"Note: This feature requires a compatible mobile device is intended for use, for example Lumia 950/XL, Lumia Phone X and Acer Jade Primo," the note under the video said.

That note however has been revised at this moment removing the Lumia X from the caption, signaling that the listed phone model was most possibly an error or that Microsoft doesn't want to give out hints to early.

For the time being, Microsoft fans are left to speculate although Techno Buffalo's Todd Haselton believes that the posting was most probably an error and the Lumia X will not be happening. Haselton instead believes that Microsoft will most likely discontinue the Lumia phone line to focus on creating the Microsoft Surface Phone instead.

According to Windows Central, Panos Panay and the team of engineers behind the Surface devices- the Microsoft Surface Pro and Surface Book- have been given the green light to create a Surface Phone, which is slated for a release in the second half of this year. This follows the cancellation of Microsoft's plans to release an Intel-powered Windows 10 phone set to release in May 2016.

The video that contained the hint of the Lumia X was a promotional video for the upcoming Windows 10 Mobile version of Continuum. The feature is a function that allows for phones to be connected to larger monitors, including PC monitor screens and television sets, and be used for presentations.