...Now that I've placed my own order for one to play with,

3D Printing
,
1

…Now that I’ve placed my own order for one to play with, go nuts!
http://www.adafruit.com/blog/2013/02/11/in-stock-kovan-open-source-smart-robotics-controller/

2

Plan on interfacing with some extra stepper drivers in order to use it as a 3D printer platform?

3

Not exactly/directly. It will involve direct-drive 3 axes of DC motors (or other DC-directional drive methods) with the h-bridges and have quadrature-encoders connected to the digital I/O for proper closed-loop control. It’s the perfect little all-in-one package for an idea of mine I’ve been mulling over, right down to the built-in battery charging and on-board 3-axis accelerometer.