From Ben Lovejoy at 9to5Mac, these rumors could make for a pretty powerful mac, but so expensive I am assuming.
Of course this is just a rumor, but it is likely though higher than the previous rumored 40 core, and 128 core gpu.
And that M2 Extreme could cost many thousands more, and 384 gigs of RAM, I am betting we are talking $7500 more than whatever the machine costs.