Looks like they just giving away some coupons at midnight. For a decent headset I have a logitech usb headset. Its about $20-$30 its a decent one no problems, very clear. Only con about it is that it uses up a usb port.
They didnt give away much. There were limited posters, a card with a code on it to win a video card and other shit, and some facebook game card. The midnight release wasnt worth it unless you went to one of the Blizzard events.