Honestly not sure if it will or not. The underwater city could still be coming (possibly as one of the big updates that've been hinted at) unless they scraped that idea at one point or another.The statement below is false.
The statement above is true.
It is underwater content but I doubt it involves a city but this update also makes it easier to add it eventually.EXP is not important, it's important to have fun and play with your friends. -Lopendebank3