Will they be louder as a result of bi-turbo?
(Excuse my ignorance!)
I was thinking the same. I thought that a turbo in the exhaust system broke up the sound waves making exhausts much quieter.
That said I think road car manufacturers are all going down the smaller turbo engined vehicles to cut emissions. So to keep F1 even remotely road relevant manufacturers want small (1.6) turbo engines.
As for bigger KERS great. More fuel or at least a higher max flow is also good.
The thing about noise is it really is only relevant actually at the circuit. So while the circuits might want more noise, the noise causes issues (for example Brands Hatch can't have F1 as their noise limits are too low, amongst other things).
The TV coverage can boost engine noise if they choose. But Bernie choose not too as he didn't like the v6 so no noise helped him!!
Personally I like the MGU-H as to me it's a great way to eliminate turbo lag and have biggish turbos plus the turbos generate extra electricity to recharge the system or give a little more power. What is not to love, well other than cost.
I would love to know more technical info about the energy systems. This is an area where F1 is pushing the boundaries but can't/won't release details as they want to protect their developments.
I would love to see a reduction in reliance on aero and increase in the potential for engineering innovation. I want to see multiple solutions to the regs and be able to see the solutions. But that's no going to happen, then again when C4 looses the rights to show any F1 I will not be paying stupid sums to Sky just for 20 odd F1 races a year.