https://www.cnet.com/news/reddit-fancy-new-redesign-desktop/

On Monday roughly 1 percent of users will get access to Reddit's new redesign. 

The new changes have been in the works for over a year now and represent the first serious upgrade to the site in over a decade. Today's rollout is something of a load bearing test. The current plan is to make an "opt-in" available over the coming weeks.