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"The minimal HP increase from the E90 hints that BMW is intentionally holding back."
I doubt this is true. The S55 (M3/M4) runs a max boost of 18psi with a 10:1 compression ratio. This is exactly the same as the S63 ( M5/M6).
The S63 in competition package guise only has 15hp more than without the competition package. This make me doubt that the ZCP will bring any meaningful hp gain. I guess the main improvments will come in steering and suspension. Also cosmetics as nicer wheels and wheel gap reduction. In summary pretty standard ZCP stuff. Nice but not revolutionary or neccessary. Not worth waiting for IMO. Quality and reliability is another story, that could be worth waiting for.
Bigger power to weight gains will likely come in a GTS/CSL type of car. Lighter with more extensive engine rework, maybe bored and with larger turbos.
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