The Zephyr will be on an extended wheelbase, I read. Will the Fusion and Milan also be that way?

Yes, they're all mechanical Mazda 6 clones with the same engines. What hp figure were we talking about for the Zephyr though? Not that it matters, the Lincoln Town Car has the same exact power output as the Grand Marquis and Crown Victoria. Ford doesn't even bother trying to differentiate cars by engine output. At least Nissan reskins the Armada SUV for Infiniti and gives it an extra 5 hp or whatever.