Look at the brownish rock. Last time I checked (which was a week ago) you couldn't see the edge of the rock, which means that the map is expanding!
The big flat rock is definitely a place that a level should be on. There could also be more levels sprouting off of it!
Another picture-perfect rock! It's under the trainer, if you didn't notice it.
Does this mean that there will be new levels? Hopefully, because we all really want them. Ideas for these possible new levels can also go here.