I think of three Scenarios
1. It would be them announcing an Expansion pack at Gamescom 2018 and release it within November/December this year which leave us 5-6 months gap between Seasons and that Packs. I highly doubt that if they will announce something at Gamescom it will be a Game or Stuff Pack. They won't invite Game Changers, Have a huge number of live interviews, and press conferences, or even be at stage just for a Stuff/Game Pack. That is spending too much marketing on a very small type of pack unlike in Expansions.
2. They will have an expansion pack release for March 2019 which is 8 month gap between seasons and the next expansion pack.
3. We will have to wait until November 2019 which is 18 month gap between seasons and that pack(which is the worst case scenario).
Its a toss between No.1 and No.2 if they are currently near the completion of EP6 then they might show it off at Gamescom. For this summer(our country here only has rainy days and sunny days so I don't know about the US one so please correct me if I'm wrong) Around July I don't think they will release any pack with it, but then if they do I hope it will be a Game Pack. Maybe they are saving Witches for a Halloween release still hope we will get a gamepack.
