Taras Buria brings soon to come changes to Edge to us in the article linked above at Neowin. I recommend reading the original article there.
Buria reports and links other articles regarding improvements namely some positive changes such as an improved password monitor, a new productivity feature (two tabs in one window), and reimagining (Project Phoenix) - Mica treatment and rounded corners, as well as the subject of this: "Discover":
(image credit Neowin)
The new button will pop the right part of the browser open on hover and on click.
In true MS deceptive fashion, it will occupy and take advantage of the former place of the Settings button...and just to annoy you more, it'll also be bright purple. Nice touch, that. By odd coincidence, it'll be the only button you cannot hide or reposition.
One encouraging point: MS's forums are getting plenty of negative feedback on the ad button. Judging by the speed they've changed the useless W11 Start Menu, we should see the ad button disappear about the same time hell freezes over.
Have a great Sunday!