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I am curious about this too. If the MCS battery is now up front, then the space where the compact spare is mounted in the MC must still be available? If you have run-flats, well then there is no need, but if you are going to get non run-flat tires for your MCS some day it would be nice to be able to mount the spare.
The MC also does not have a spare even with non runflat tyres. This has a reinflation kit instead of a spare (at least in the UK).
The USA MC, at least the R53, has a compact spare mounted under the car. The hardware that holds it in place is accessed from the boot. I'm assuming the R56 MC will be the same.