Most likely not: Both the Fusion and the C-Max have bigger front ends--I would bet that that powertrain is too large to fit in the available space in the Focus (Electric or not).
Ford did, however, trademark "Focus Energi" so maybe they will be shoehorning something like that in there. Perhaps by the time your battery goes you could fit that in there (although at that point it may be more cost-effective and time-effective to just purchase a "Focus Energi", or a 300 mile Ford EV SUV).
