I love reading about newly discovered works from the ancients. I'm really hoping some of the missing plays and history and math shows up here. There are also those burned red sea scrolls, I hope later tech can read them.
The most interesting possible source of lost books that I know of are the burned scrolls found in Herculaneum [0]. We just need medical imaging to advance a bit more.
Unfortunately those are philosophical writings, the bar for "most interesting" is really low here. If you are looking for Sappho or Euripides or even Ennius, it's not in there.