Back in December, Microsoft announced that it's rebuilding its Edge browser from Google's open-source Chromium. A big part of that is that it's coming to platforms beyond Windows 10, such as macOS, Windows 7, and Windows 8.1.
Interestingly, the browser could also be coming to Linux. Officially, the operating systems shown in the image above - from a session called 'Moving the web forward with Microsoft Edge' - are platforms that Microsoft is currently evaluating, although everything except for Linux is already announced.
The key topic of the session was the developer platform, and developers were a major reason why Edge is being brought to the Mac. Many web developers use Macs, and not having a browser for macOS makes it a non-starter for developers. Of course, many developers use Linux as well.
Linux support would also be important for Chrome OS. Another big message in today's Edge sessions was that Microsoft really wants the browser to be available everywhere. When the above slide was introduced, it was shown as platforms where Edge will be available, and Linux apps now run on Chrome OS.
But as mentioned above, the team wouldn't confirm this, and would only confirm that Linux is being evaluated. It does seem like the next logical step though, and since Chromium already supports Linux, that step isn't a big leap.