Note: A minor update was released for both Android and iOS. I think it was mostly for Go Plus support, but if you notice anything major, be sure to let the community know!
I'm not a huge fan of Tentacools, so, meh -- Bellsprouts and least grow into Victreebels, which are amazeballs in water areas against all the Vaporeons.
Re: "nests" and "frequent spawn areas"