Since the hybrid era started (2014), Mercedes has dominated F1 winning 7 teams championships and drivers championship as well. Mercedes has been using a split turbo/compressor design, this style has advantages including packaging of the power unit, a reduction in pipework and a separation of the hot turbine and the compressor, which also allows for a smaller intercooler.

In 2016 Mercedes talked about the difficulty it was to get it right, doing 600 computational fluid dynamics simulations to get the primary design phase kicked off. The idea was copied by Honda in 2017.

Remi Taffin was asked by Motorsport.com if that change was being considered: "The simple answer is yes,”

“We could be going down that route….I'm pretty sure you've seen some photos, so I'm not going to lie. We are evaluating.”
As for their 2021 engine, Taffin says modifications that were originally planned for 2020 is what they've focused on for this year. The pandemic forced a delay to their plans. 

“We implemented the modifications we did [originally] forecast for mid season last year into this year. So it's more of an evolution that we would have in-season rather than over the winter.”

Italian media has reported Ferrari is considering this design also for 2022.

After five seasons as Renault F1, the french team was rebranded as Alpine F1.

Alpine just presented its 2021 car, the A521 powered by the Renault E-TECH 20B power unit, driven by Esteban Ocon and two time Formula 1 champion Fernando Alonso.

Mercedes F1 engine secrets with Craig Scarborough