The source of the information is insider @noarmsandnolegs, who revealed details about Rayman Legends Retold even before the State of Play presentation. His information was later fully confirmed by the official announcement, which increased confidence in his new statements.
According to the leak, Ubisoft has already prepared preliminary plans for the next installment in the series. However, the decision on further development will depend on the sales of Rayman Legends Retold.
Essentially, the re-release is intended to test audience interest in the franchise. If the updated version of the platformer shows good results, the company may greenlight the first completely new Rayman game in many years.
The last main installment in the series, Rayman Legends, was released in 2013 and is still considered one of the best platform games of recent decades.