I remember when I was young and they gave me a complicated toy, like a radio-oriented car, the first thing I did was to take a screwdriver and take it to the side to see it inside. The same thing happened with iOS.
Whenever a new version of the Apple firmware comes, there are technicians who use reverse engineering to get into the firmware and explore its interior looking for new features. Looks like they got the picture of the next Powerbeats4.
It looks like new wireless headset photos were found in the latest version of the iPhone firmware. It will probably be the new Powerbeats4, which has not yet been released. This image just appeared in the iOS13.3 beta in December, and is today approved as it is in the final version of iOS 13.3.1.
Based on these new images, it seems The new Powerbeats4 will introduce the design between the current Powerbeats3 and Powerbeats Pro. These new heads look like they have a more compact design such as Powerbeats Pro, with similar angular adjustments to the ear and input penalties.
However, Powerbeats4, like the current Powerbeats3, will continue to be connected by telephone between left and right, since the cable that disappears down from the base of the ear can be seen in the drawing. They no longer work over the phone via Bluetooth, but the two heads are connected by a cord.
We can expect the new Powerbeats4 to offer features similar to those on AirPods 2, AirPods Pro and Powerbeats Pro such as H1 chip for better communication, and new Siri functions.
In short we can say that Powerbeats4 is a bit like Powerbeats Pro, but with a cord between two headphones, it's a lot cheaper. If the current Powerbeats Pro costs 249.95 Euros and Powerbeats3 199.95 Euros, we can get an idea for the new price.
The release date of these new Powerbeats4 is not known yet, though Once they are embedded in iOS 13.3.1, their availability will be soon.