This morning's live stream of Notch coding part of the shape editing engine for 0x10c included a very brief moment where he typed out his pronounciation of 0x10c on the screen. It's not clear how he got to this (or even if he was just trolling the live-stream viewers), but according to notch, it's pronounced ten screw:
The above image is a zoomed frame, taken from this full screen capture of the live stream:
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