Dark mode starts showing up in Gmail for Android
The dark mode seems to be available in settings only for the time being and pops up randomly whenever it wants. This is more of an indication that Google is close to nailing it down rather than an official release, but it's what we have at the moment to keep you hyped.
Gmail is probably one of the most popular Google apps for Android devices, so it's kind of a bummer that the Mountain View company didn't think that it should implement a dark theme yet, while other less used apps have been treated with a dark mode a long time ago.
Apparently, the dark mode appears in Gmail v2019.06.09, so if you have this specific version installed on your Android smartphone, you might sporadically enjoy the new implementation of dark mode, at least until a full-fledged version will be released.