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 in a tiny rural town so I get to keep a pretty close eye on the frequent spawn areas, of which there are three (along with one gym and one Pokestop). They definitely switch around - we used to have a frequent Eevee spot which switched to Staryu, and a Clefairy spot that switched to Ponyta.
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Re: "nests" and "frequent spawn areas"