My first thought about the Preserve district is that, hopefully, they've slighted edited Bull Moose Teddy's ability around it to make him less busted. Current Bull Moose Teddy is still absolutely insane and I cannot understand why he still hasn't been nerfed - all that additional Science or Culture given, for free, with no opportunity cost just makes him ridiculous to play as, and eye-rolling to play against. I don't mind him keeping the ability as it if it is limited to cities with Preserve districts, because we know the District comes early on the tree (probably at Mysticism, given that's when the Grove unlocks). At least then BM Teddy isn't getting +2 Science and +2 Culture on almost every tile from Turn 1, and players choosing to build the Preserve then lose district slot in the city, which helps balance things out.
I dunno, just my two cents. They probably still don't even think BM Teddy needs any balance, and would rather just overpower him further...
I could definitely see them wanting to edit Teddy to work with the preserve. Certainly wouldn't mind giving him a full update - something like "Preserve districts don't count as a district slot. +100% production to preserve districts." and then maybe also adding in some basic bonuses (like +1 culture/science for breathtaking tiles, rather than the +2/+2 he gets now)