I believe I would most probably be using mostly ABS or at least I did when I had my old printer, but my son might like PLA more. As for how I plan on using it the sky is the limit really. My son likes to whip up things in blender and prototype and I do all kinds of crazy things, I make furniture, play tabletop wargames, garden, model and paint.
Hey that video (at the bottom) is pretty cool, who is the girl singing in it? I'm unfamiliar with that music
So there are people working on dual extruding alternatives even if its not something being officially done at the moment. Excellent!