TL;DR
Reports say the official Ecco The Dolphin website features a countdown timer with 21 hours and 43 minutes left. This could be a reveal for a new game from A&R Atelier or their previously announced remastered collection.
Ecco the Dolphin · official art via IGDBA timer showing 21 hours and 43 minutes left is now active on the franchise page. This may be a reveal for a new game or the special remastered collection previously announced by A&R Atelier. The studio consists of former developers from the franchise who previously confirmed a fresh title is being developed.