Isle Delfino looks pretty cool, leads me to note that there are a fair few Mute City-esque docking stages (Delfino, Halberd, possibly the Great Fox level featured in Fox's premier) so far.
...And today's update makes me sad. That was cheap, I hope they minimise the amount of 'How to Play' updates.
EDIT: Not much point in analysing it since the game's incomplete and this probably won't apply to the final product, but damn that looks like a massive third jump Mario has there. Assuming it was activated from where the effect is, he catches a lot of air to be able to latch onto the ledge, more than I seem to recall him ever managing previously. Maybe I'm just seeing it wrong.