A preview of Microsoft’s new Windows 11 operating system may have been leaked online.

Some purported new features include a new startup sound, Start button and centered menu, and rounded corners on the interface border. The menu can be moved to the left side of the screen, too, reported The Verge, which spotted an array of Windows 11 screenshots on Chinese social network Baidu and then found the entire operating system online.

“Coupled with the dark mode that’s also available, and Windows 11 starts to look like a more refined version of Windows 10 than something dramatically new,” The Verge’s Tom Warren wrote.

Gamers might be interested to know that Windows 11 reportedly has the new Xbox app integrated “offering quick access to Xbox Game Pass games, the social parts of Xbox network, and the Xbox store,” Warren wrote.

Microsoft did not immediately respond to a request for comment from U.S. TODAY.

Online response to the possible early glimpse of the new Windows operating system was not supportive. “Please tell me this isn’t real,” tweeted one viewer.

Microsoft has a June 24 event scheduled to reveal “what’s next” for Windows.

Microsoft CEO Satya Nadella, during last month’s Microsoft Build developers conference, said he had been test-driving the next Windows operating system and was “incredibly excited” about its prospects.

“Soon we will share one of the most significant updates to Windows of the past decade to unlock greater economic opportunity for developers and creators,” he said.