Mojang are trying to finalize 1.13.1 and get it to you as soon as possible. They're pretty happy with where 1.13.1 stands now, and are aiming to get the full release out next week unless some major bug pops up.
Update Aquatic is out now for Minecraft: Java Edition. Take a delightful swim with dolphins and tropical fish. Explore mysterious ruins and tragic shipwrecks while hunting for new deep-sea treasures. And much more!