nope - no dual extruder.
To be honest, it sounds like something that would be really useful.
I do have a dual extruder (well 2, on one I simply replace the second extruder with a plastic 'model') - but it pretty much just gets used for flexible filaments.

Unless you can afford an IDEX (independant dual extruder) setup, dual extrusion is somewhat problematic and nowhere near as useful as you think it's going to be.