I think the spawns now depend on the density of players in the area. I was monitoring a park, and until 10pm, there was a ton of pokemon spawning on a 1h loop. At midnight, it was more sparsely populated, and that went until 10am... the spawn are starting to pick up now.
Oh, and of course, the Dratini spawns at that spot got killed by the reshuffle into Evee spawns:
PSA: Nests have changed! : TheSilphRoad
(I was looking at the spawn when it changed... one moment it was all Dratinis... two hours later, no Dratini in sight, and loads of Evee at the same spots)