Here's an interresting quote from the Korg site:
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Keybed

Korg has provided the best weighted piano shaped keybed available – designed and built in Europe in a 76 key version.

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Does that mean, it has piano FEEL keys, or just piano SHAPED keys. Maybe it's the waterfall design like Roland's new 760. If they are piano action keys.... that'll add to the weight factor. Hmmmmmmm........