Just got my Beckett MOG Magazine and on top of a code for a majorly cool looking Warpwood Staff, there is also an interview with Todd and Josef.
From the most recent Newsletter we all have seen the crab wearing the Celestia Ribbon. Well in the very first question of the interview they ask Todd about their inspiration for new worlds.
Direct quote here: "... like "How about an Empire of Crabs with a Roman feel?"
So there we go definite proof. Celeste will be a Roman themed world with crabs as the main characters. And with crabs as main characters may be water themed world, possibly.