The current post-game content can be obtained by starting a new game. For the After Stories (which get unlocked after you get the character's perfect end) you'll need to wait for an upcoming update.
Viewing post in Changelog 'FullService Release 1.1 PC' + FAQ comments
Because, they fist correct the bugs resported by the comunity, if they add the rest content and don´t fix first the bugs the game would be imposible to play. Regulary take around two to three weeks for fix all the bugs in all the games. For the moment is important report in the site all bugs you notice.