This is just the placeholder for the mysteries project that seems to be in work for 4 years already according to the founders of IOTA.
Theories go from Qubic to Cogniota, to an energy trading platform to a quantum network.
CFB once said:
"24h after Q's announcement, IOTA will reach #3 on coinmarketcap.com"
We don't know whether this is true or not, but the community expects a big project behind Q that seems to have incredible potential