Bandai Namco has recently opened a teaser site showing a microwave oven and an egg, and those of you who are familiar with My Hero Academia they might know something or two about it.
The first suggestion is the "mhaoj" in the URL that it could represent My Hero Academia: O___ J___. As for the reference to microwave and egg, for those of you who do not know the series, the protagonist Izuku Midoriya has difficulty controlling its power in the early stages and uses the mental image of an egg that does not explode in an oven microwave to adjust its power.
Anyway, we'll find out what this is about 4 December when the countdown will reveal what it is. Until then, we just have to wait.