I have no idea why the full details for this announcement are only on the official Magic Online Tumblr account, or why the page is absurdly dark when I load it, but this link provides confirmation of the removal of Pauper 8-mans and daily events and the launch of Pauper Leagues. The league will be added after the November 25th downtime.
The announcement also strongly suggests that other formats will be moving away from scheduled events and towards leagues, so if you were looking for a Legacy league, odds are it's on the horizon.
I like the idea of more formats having league play, though what I really want to see is leagues with more competitive stakes. I've seen this opinion expressed vocally on social media, and I would hope that more competitive league options open up in the future.