Following the release of the Bluetooth 5 and the android O (Oreo), android smartphones had the ability to connect to two bluetooth devices simultaneously.
Google has decided to increase the number of Bluetooth devices that could be connected to android smartphones at once.
The android P developer preview was released just yesterday. Amongst the features discovered by the developers already with the android P, is the ability to connect to up to five bluetooth devices simultaneously.
With the release of Android P, you can increase the number of bluetooth devices connected to from 2 to 3, 4 and 5.
The setting to activate connection across five bluetooth devices is hidden in developer option.
The only draw back to this at the moment is the fact that connection between five different audio devices with Spotify on will be impossible