Niantic has announced that players living in Rural and Urban areas should start seeing more Pokémon spawns in their areas. Here is the official word from the Pokémon Go Twitter account:
Are any of you experiencing any increase in Pokémon in those out of the way areas? Currently, we haven’t noticed much difference where we live – but the update may not have made it this far east yet either. Let us know in the comments below if you have noticed any change!