That’s indeed not a coincidence. It’s a game by James Mielke, who worked with Mizuguchi at Q Entertainment. The music by Genki Rockets (Child of Eden) is also very recognizable in the trailer here. On a related note, James also made the Panzer Dragoon retrospective when for 1Up. It’s a small world!
As for the game itself, I can’t say it really reminds me of Ecco, other than the fact that it features dolphins. Looking forward to more details though.