I've seen increased spawnrates for Squirtle, Psyduck, Poliwag, Tentacool, Slowpoke, Krabby, Goldeen, Staryu, Magikarp, Omanyte, Chinchou, Marill, Wooper, Qwilfish, Remoraid and Mantine.
Unfortunately haven't seen any Totodile, actually zero. And also no Kabuto, maybe these are only spawning in certain locations. Omanyte seems to only spawn at work so today I went back to where I found Kabuto but no luck. Was hoping Totodile would at least spawn more everywhere but it's actually decreased from about 1 a day to zero.
At least there's shiny Magikarp, though I'm expecting it to flee if I find it.