The K60 parts available at launch do not support DDR. K60 parts that include that feature will be released around the end of the year. So the TWR-K60N512 board only has the Flexbus interface, not a DDR interface.
You can look at the K60 Product Brief, section 4.6 for the full run-down of the features each K60 version will have: http://cache.freescale.com/files/32bit/doc/prod_brief/K60PB.pdf
The K60 on the tower board is the K60N512VMD100
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