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It's a configurable option. If you scroll down on that Apple.com page, you'll see this on the 13" and similar on the 11": "DKK12,099.00 model configurable to dual-core 2.0GHz Intel Core i7 (Turbo Boost up to 3.2GHz) with 4MB shared L3 cache."

EDIT: Apparently the OP figured it out by himself...
 
Yea well sorry, figured it out right after I posted. But it sucks, that it isn't possible on the 128 gb 13"! why's that?
 
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