Radiohead is releasing OKNOTOK 1997-2017, a 20th anniversary reissue of their classic album OK Computer tomorrow. The reissue is coming with three previously unreleased songs, including "I Promise," "Lift," and this version of "Man of War," a song that the band has been playing live for years, dating back to The Bends tour.
If you want to read about OK Computer, and why it is regarded as one of the best albums of the past 20 years I highly recommend this piece by Stephen Hyden. If you enjoy a good oral history, then I highly recommend Andy Green's feature on OK Computer for Rolling Stone.
There are not a whole lot of albums that I personally get excited about anniversaries for. I absolutely enjoyed the remix to Sgt. Pepeprs that came out around that albums 50th anniversary, because it really changed the experience of listening to that album. Getting solid studio versions to songs like "Man of War" makes this reissue feel vital in a way that just doing a new mix would not have.