left spawn can never get mid TP first passage, right spawn can get it about 60% of times. This is assuming most optimal explorer micro and Otto civ. India Japan can get it from both sides (gl making use of it and defending it). Mid spawn is worth 25 seconds on first shipment for right spawn, 35 or so for left spawn. If you lose the passage (NB: you get it literally by 1 second) then it's 1min+ wait till the next one.
Hunts are identical. In fact now hunts are closer (distance has been downscaled to adjust to map size). Mines are also closer but there is a good chance to get one exposed in front (intended as it's 3 a mine setup). Goats hunt were supposed to be 6, now they sometimes are only 5 because of space. It's ok.
Dunno about treasures. I never saw that and it makes no sense for it to happen, has "avoidedge" constraint is the same. Nothing has been changed in that regard. Treasure location is indeed partially different just because of map resizing and treasures moving to other places where they find room to spawn.
First hunt might get bugged occasionally just because of closer starting stuff and probably slightly undersized avoid overlap constraint.
I tried increasing size of the map size (in between old and new) to see if it helps with the first passage. It doesn't really. Travois reach mid TP at 47 seconds in both cases, so it's again about luck to get it or not.