It's referring to the keys that razer now has manufactured for them, ( Cherry Corps patents ran out on the mechanical keyswitch design) they adjusted the actuation points on the keys and the reset points so that they can be registered a lot faster on the (razer) green switches, in my opinion this is a vast improvement over blue keys, and they are essentially MX brown keys but clicky, I'm not sure exactly what the Razer orange keys are, but I want to say modified mx red/black switches. I've read an article about the Razer Green switches, I bet oyu can find what the orange ones are, I've typed on them, they seem fairly run of the mill mechanical red/black switch.
"Gamer" peripherals are so dumb. Can't they sell normal looking keyboards marketed to everyone? Of course gamers will buy them (I want to get a mechanical keyboard but don't have the cash right now) but marketing solely to gamers is kinda dumb, and the keyboards are often really ugly.