I received a D1 as a warranty replacement, and it feels like there is some airflow going into the unit, so I suspect there are vent holes around the top of the unit (where the bling LEDs are). The fan is much quieter -- unlike my previous C2, there is no discernable fan noise when capture starts. The impressive thing is that it is noticeably much cooler to the touch than the C2, and I feel like I can actually leave it on 24/7 if I had too without being concerned with it burning out.
I won't, though.
I just don't understand how it took 4 months to come up with, "fan + holes" as a cooling solution.