There is one thing that will undoubtedly happen, tomorrow we are getting a new update report, not the update itself.
The update will come out either on the Monday after the next, or a few days afterwards. My personal way of judging when the update will come, is by how far along the translation of the update is on the third report of the month. If Fujino says he just started the translation, instead of being somewhat further in the task, that means the update will not come exactly on the fourth Monday of the month but a bit later.
Regarding the new mini-game, we have two possibilities, it will either come out alongside the update or maybe two weeks afterwards, Fujino's clarification was not very clear on English so we can't tell for sure.