Here's a summary from my review:
"Created in 2021, we find three Cast Reunions. Hosted by Stephen Colbert, we find these virtual panels:
Actors Elijah Wood, Sean Astin, Billy Boyd and Dominic Monaghan (39:39);
Actors Cate Blanchett, Viggo Mortensen, Orlando Bloom and Liv Tyler (32:25)...
I don't know what the Potter thing you mention is, but the "Middle-Earth" set includes those 3 new Zoom panels with prominent cast members and PJ - doesn't that count as a 20th anniversary "look-back" of sorts?