That's a hell of a rollercoaster with the August wave! I think we should greatly appreciate all the info we get that many months ahead and at the same time not expect and demand from those best informed to share and disclose everything immediately or pressure their sources. It's awesome when you can share or hint some new leaks, but it is still great to read your input when you just discuss the possibilities knowing as much as all of us :)
As for my thoughts on the probable D2C I can see few scenarios:
- worst option (of course based on my preference) - it's just the set numbers gone wrong and the 250$ will be the buildable figures of Harry and Hermione with enough spare parts to swap Harry's head for Ron (or - thriller version - put his poor head on a silver platter somewhere in between Harry and Hermione ;p)
As for things outside the known list I believe we can get:
- Gringotts )one can only hope!), at this price it could include one more building from DA, perhaps Madam Malkins or Eeyloops? I don't think it would be The Leaky Cauldron or Borgin and Burkes as it has to work as a standalone set as well and linking those together wouldn't make much sense.
- motorized Hogwarts Express including a full track loop, Hogsmeade Station and more than one wagon (it could connect to the Hogsmeade set we will be getting in June. It's a bit early for a remake of the Hogwarts Express, but that could certainly explain the price.
- Quidditch Pitch with all around stands, two full teams and some exclusive prints for spectators (McGonagall with a Gryffindor scarf etc.)
- Triwizard Tournament - with that price point it could be a set combining all three tasks together with three scenes that can be combined into a full "landscape". Such set could include a part of the stands from the first task with a new dragon and rocks to stand on, a lake part with a platform and a modestly sized Durmstrang ship and perhaps a side scene with Merpeople and finally a part of labirynth with a cute Blast-Ended Skrewt to keep the contestants entertained ;)