Dang it! The teasers are killing me. I've no idea why I'm so excited for new stuff in TS4, I was never like this for TS3... maybe I'm coming down with simsickness.
Is it just my vivid imagination but are those windows at ground level behind the sims sitting on the edge of the pool and indication of a basement? And is that steps going downwards towards those windows ? (Look behind the dark haired sims head).
Maybe the pool has been built above ground for aesthetics though...
( @Bri, just delete my post if we're not supposed to be posting guesses/wishes etc)