The Source has little information at this point. However, one sign says the menu will include fresh-baked Japan bread, sweet and savory crepes, Belgian waffles, chiffon cake, bubble tea, and coffee.
Googling “Japan bread” turns up several options, so it’s unclear what type (or types) will be on the menu. Various sources, however, say the most common type is shokupan, Japanese milk bread. It is described as “very airy and sweeter than other white bread around the world.” It is also sometimes made with rice flour.
The Source will provide updates as more information becomes available.
Photos by David Lay. h/t Reddit user jobogo2