Reall although we haven't seen an all water stage or a charcater under the water, don't rule it out yet. I know they made an effort to increase the action in the air, why not take the action to the water? I can already see a batle where someone is getting pummelled and they take to the water. The other character follows them to find out that their moves don't quite work the same wet and the one who was getting pummelled becomes the pummeller. The water/air tactics are the new AT's in fact I dub them WAT's! Like I said previously the AT's as we knew then are gone and Brawl has something else entirely.