Ford Mach E getting RWD trim and different battery options?

Last week, Ford announced a partnership with Electrify America to benefit buyers of the Mustang-inspired crossover that we're calling the Mach E until we get something official. The crossover owners will pay for charging through FordPass, but won't need to pay the Electrify America's monthly subscription fee during the first two years of ownership. At no point in all the discussion of the Mach E has anyone provided reliable intel on a rear-wheel-drive only version, nor various battery packs.