It seems the website's had a few updates to the explore tab, and there's a load of new screenshots & concept art.
- There are 4 background images (right hand bubble directly under the tower)
- A "follow me" star game which once you complete get a piece of music (for download) from the game.
And also I think the picture on the explore tab changes based on whether it's day or night time for you. I had a quick look while at work earlier and I'm sure it was different to what I see now. Currently it's 21:00 here and I get a night time image with a scary thing at the front. Anyone currently in day time able to confirm?
If I'm right I don't think the hotspots change, just the image.