Japan will be joining tomorrow’s North American and European 3DS-focused Nintendo Direct streams. Nintendo of Japan announced it will hold a Nintendo Direct Luigi Special 2 tomorrow at 23:00 Japan time (same time as the western streams).
Considering the Japanese Nintendo Direct will be Luigi-focused, it’s likely western streams will be, too.
The last Luigi direct included announcements of Mario & Luigi: Dream Team, Mario Golf: World Tour, the New Super Luigi U download content for New Super Mario Bros. U, and Donkey Kong Country Returns 3D.