Square Enix has filed trademarks for “HD-2D” and “HD2D” in Europe, and FuRyu has filed a trademark for “Heroland” in both United States and Europe.
“HD-2D” is the term used by Square Enix to describe the graphical aesthetic of its July 2018-released Octopath Traveler. With the term being trademarked, it is possible that the company plans to use “HD-2D” as a descriptor for future titles, Octopath Traveler or otherwise.
“Heroland” might be the localized title for FuRyu’s Netchubiyori-developed comedy RPG Work x Work, which is set in a theme park called “Hero-sama Land” in Japanese. The game launched for Switch in October 2018 in Japan, and is due out for PlayStation 4 on February 28.
Thanks, @the_marmolade (HD-2D, HD2D) and Siliconera (Heroland).
Update 02/02/19 at 7:10 p.m.: Square Enix has also filed “HD2D” and “HD-2D” in Japan.