“I think there’s a good chance that a new cliff-face tomb (not just a pit “tomb” like KV63) will be found in the next year or two. Let’s keep our fingers crossed.”
Did they find one?
I don’t recall there having been one in the Valley of the Kings, but there are always newly discovered tombs. The work that cleared KV-40, which had previously been filled with rubble and of no apparent interest to anyone (it had been known a long while) was finally excavated, and that took some time, 50 mummies or parts of mummies were found, news came in 2014.