The 512Ke did come with the 800k drive built in. It would likely have shipped with the full sized keyboard, too. They probably put the 512k/800 designation on the box so the two different models wouldn't be confused on the shelf. You wouldn't want to sell someone the older model with the 400k drive if they paid for the newer one.

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Quadraman, the 512Ke did NOT come with a full sized keyboard. Apple likely discontinued the numeric keypad in order to encourage an upgrade to the Plus keyboard. The 512K was discontinued in March '86, so Apple was likely still making 400K external drives until then to encourage accessory purchases. Then again the HD20 init made the 800K external usable so, they probably discontinued it when they introduced the 800K ext. drive (they could charge more too).

See this for more details:

http://homepage.mac.com/chinesemac/earlymacs/#Plus_hardware