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You mean this pretty little toy? The HKT-01. Not much is known about it, but I'm sure there are places to look, though I've never really dug around for specs on it. There is a bit of info here: http://assembler.roarvgm.com/Dreamcast_Developer_Unit/dreamcast_developer_unit.html

 

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WOAH! man i would love to play with that toy! its sooo cool! and i already been to that site. pretty useless to me now.

Do u own the DevKit yourself???

I wish I had one. But they do sell from time to time on ebay, just be sure to note the price.
http://cgi.ebay.com/Rare-Dreamcast-Katana-development-setup-Debug-and-Dev_W0QQitemZ8223190934QQcategoryZ62054QQcmdZViewItem
Some more (and better quality) images of this kit. Note the original price of this kit: $24,300 oO

 

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As far as I know, the Katana is just the Software Development Kit, (which I'm fortunate enough to have:evil: ), but does not include any hardware. In my copy of it, there's a GD-ROM mastering application, a debugger, a Visual Memory Unit emulator, a compilation program and misc documentation on Dreamcast development.