WhatsApp's Dark Mode for Android has been revealed. This feature has been in the beta version 2.19.82 however the feature has not been enabled yet and cannot be seen. Read more at businesstoday.in
This feature still seems to be under development and is not yet publically available. With this dark mode feature users can see improvement in their experience and it will also reduce the battery consumption of phones mainly the ones with AMOLED display.
Dark Mode feature on WhatsApp will be quite beneficial for users. The mode is not a fully black mode. There are several images of this mode that has been published by WABetainfo noting that the feature has been implemented in Settings only.