These are RGB Panels to really make your V0.1 a mini party on legs. 32 Individually addressable RGB lights behind special diffuser acrylic panels and you've got an amazing looking printer (Dan rocks these on his V0.1 to make it go faster).
This comes with the panels, the RGB PCBs pre-populated, and wiring harness. Super simple mod, super cool!
For more information check out Timmits99's Git on them here.