Apparently we took Arceus and added... Sim City?
The next main Pokemon game appears to be waiting a full three years from its predecessor.
The "one more announcement" of the Pokemon Presents was a new Pokemon Legends title. Subtitled "Z-A", the title will be developed by Game Freak and will launch simultaneously worldwide in 2025.
Z-A will be focused on the Kalos region of Pokemon X and Y, as the trailer focuses heavily on a "Lumiose City Redevelopment Plan" (with Lumiose being the hub city of Kalos). Mega Evolution, introduced in this region, will be returning in some form.