Main Quest 5 is scheduled to release "early July, 2017" as a short introduction to the Roppongi Tycoons guild, leading into Main Quest 6 shortly after.
Tokyo Casino Gacha is also scheduled to release "early July, 2017", focusing on characters in the newest Main Quest:
As with the last, a release campaign is scheduled for release "beginning July, 2017".
A rerun of Agents Encounter for those who missed out on it starting from July 9th, 2017 to July 31, 2017
Three limited time quests aimed toward helping new players level up their units in order to complete main quests, each of them focusing on battle agaisnt a single element and providing high card exp, all type Boost items from S to L and Coins. Be advised that those quests are not meant to replace higher level dailies and are most suited for units under level 20.