According to an open letter to the community Justin Sun announced TRON 4.0 release on July 7th 2020 quote "TRON has undergone three significant iterations and is now ready to embrace its fourth, TRON 4.0, on July 7th, 2020. The anniversary marks the conclusion of the TRON Odyssey era and heralds the beginning of TRON 4.0 — the era of the Great Voyage."

You can read the full 2-min letter  here .

Despite this announcement I still can't find anywhere if this new version has been released or even delayed