New Ultra Sun & Moon Dawn Wings Necrozma, Dusk Mane Necrozma & Dawn Wings Necrozma Japan Pokemon Center Plushies are being released on Nov. 17th, 2017 to coincide with the release of the new Pokemon Ultra Sun & Moon Nintendo DS games.
The actual size is not known yet, but based on the price, they should be rather large size. These will be available on Pokevault.com on November 17, 2017.