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"Set to get an all-electric version during its lifetime."
Hopefully it really does get a 90kwh pack but the bolded part indicates that whatever it is, it won't be available 'til after 2018. 2020 was speculated.
I think BMW as well as MB better get some decent EV's on the road if they want to stay relevant 5 years from now. Probably faster than they had planned with a little kick in the arse from Tesla