So, they're supposed to reveal the next Transformers HasLab. It's G1 themed to celebrate the 40th anniversary of the brand, which is all we know so far. Not sure if this is a viable theory in any way/shape/form, but it's probably the one thing that could get me to consider spending the kind of money that a HasLab takes:
A Mount St. Hilary / Autobot Base Playset.
I've always heard that there are no playsets made anymore because they don't sell like they used to. That would be a great reason to do one as a limited release type of thing. Give me a mountain that opens up into a playset with a few of the rooms shown on the old cartoon and I'd be happy. It can be fairly simple, parts wise, compared to an actual transforming robot like Unicron, so there may be room in the budget for a larger size. I could even live with it being scaled for Core Class figures instead of main-line.