It ships with the SCA3302 for Maxxum models. Yes, you can change it later with the MZ series strobes. B&H is most likely still shipping the SCA3302M5 foot (the M6 is hard to come by since it's new). But, the M5 works.
The MF series strobes do not have a changeable foot (and you don't have the same feature set, auto mode, etc. with the cheaper MF series). I'd probably steer clear of those (although I don't know anyone that's tried one).