Are the brakes and suspension on the Commodore/G8 shared with the CTS V, from the looks of the brakes on the G8 look vary simular to the ones used on the ~05 CTS V?

I doubt they'll have the same brakes, considering they're on different chassis'

although, I'm sure they'll be similar

CTS-V's have Brembo brakes. I don't see GM using them on the G8 in production.