I'd imagine that we'll see the new design on the Whirlpool side by next year. Typically it seems like WP treats their lineup the way car companies do, for example you'll see more premium features on an Audi before it trickles down to a VW, or a Lexus down to a Toyota. (I'd say Acura to Honda as well but for the past several years, Honda is getting the sexier interiors and features and Acura's line is so stagnant and dated.) So that said, with KitchenAid and Maytag being Whirlpool's "premium" brands, they're going to push these new models for a while as "new and luxury" and the Whirlpools will stay with the GlobalWash platform a bit longer.
Who knows about a TotalCoverage arm in the new ones, because I love the sleek minimal steel arms in the new models, but they put so much time and work into that TC arm and it actually WORKS and isn't just gimmicky (looking at you KitchenAid with that ugly three armed monstrosity), it would be a shame to just scrap it.