The DEX is already implemented into the Litewallet. All orders, buy, sell, ask, bids, are almost instant. You don't need to wait for confirmation.
Fast, easy and safe.
Soon they will add charts and other features.
Which was the main point I guess, make it look like a exchange instead of a wallet.
That way they can grow even further comparitively to other coins. That is a new feature we never saw on any other coin and that makes Waves what it is, it is their gimmick. I think since it is implemented now it will only go higher.