Unfortunately, there hasn't been an official announcement yet. His last book, 'Inferno,' came out in 2013, followed by 'Origin' in 2017, so he typically takes a few years between projects. Given that pattern, I wouldn't be surprised if we hear something in the next year or two.
Rumors suggest he might be working on another Robert Langdon adventure, possibly exploring hidden histories or cryptic symbols tied to a new global mystery. Brown's research is notoriously meticulous, which could explain the delay. Until then, I've been revisiting his older works like 'The Da Vinci Code' and 'Angels & Demons,' which still hold up incredibly well. The blend of art, history, and conspiracy is just as thrilling on a re-read. If you're craving similar vibes, Steve Berry's Cotton Malone series or James Rollins' Sigma Force books are great alternatives to tide you over.