There have been a few developments:
+ Original screenshot showing 170 pagies, 1400 quills, 6 mollycools...
+ Andy Robinson tweets that this screenshot is from an old press build!
+ New screenshot showing Hivory Towers totals- 20 pagies, 200 quills, 1 health extender, 1 power extender.
+ Someone spotted a pagie in Shipwreck Creek (in the character parade).
So there's evidence for 6 worlds (25 pagies, 200 quills each) but the pagie in Shipwreck Creek goes against this. All this with Andy's response makes me think there are 6 worlds but maybe the pagie totals have increased beyond 170. The Shipwreck pagie could always be more like a character who gives you information instead of being an item you collect. Chris Sutherland mentioned 5 worlds at EGX a few times, though...who knows?