Stuff like this was already hinted through the story and the calendar man easter egg, so I'm not surprised however, not starting the joker season with any story missions was a gigantic fumble, maybe they are holding them for episode 2, but with how things are going they should've just dropped the story bits as well right away.
Now it just seems like they are holding on to their original content drip plan, which is a bad idea; instead of 4 slow seasons and then two final ones, the first two already needed to heavily further the story.
Will see how they handle s1 ep2, but I doubt it will be anything good.