In fact, the other week we noticed this was coming and reported it back then.
The new tool seems cleaner, more spacious and faster than the previous tool. The first mobile friendly testing tool from Google launched in November 2014, this is the largest looking update to the tool since.
Here is the new look:
Here is the old look:
Yaniv Loewenstein from the Google Search Console Team wrote:
The updated tool provides us with room to continue to improve on its functionality, and over time, we expect it to replace the previous Mobile Friendly Test. Additionally, of course this tool also works well on your smartphone, if you need to double-check something there!
Here is a screen shot of the alerts you might see:
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