You'd be surprised how early they start "thinking" about it, as odds are they are planning for either situation that can take place (limited or full capacity, based on COVID).
The FP buildings are fully cleared out, Lumberhack is sitting in a state of disarray, DK building is probably still sitting Christmas-ified, and I haven't seen CS or the basement of Pompeii recently. The point is, if they want to put on a HoS this year, it will take a lot more premeditated work than usual, as most everything that is already set up year round needs at least some TLC. Losing FP is a big blow as that section just eats people, so they will have to be very strategic with how they place houses, all assuming a full capacity event.
My personal guess, expect a full capacity HoS. Maybe not full-budget, but traditional HoS, maybe one or two houses shorter than usual (which means longer lines).