PricelineNegotiator

What exactly is the meaning of "2 Multiplayer Scenarios"? Am I correct in assuming that a scenario is like a mission is in Arma 2? Also, with modding, will we be able to create our own scenarios or missions? What about development tools like Oxygen, will those be available for the Alpha launch? Very excited for the Alpha to begin and proud of the BI staff supporting their community so much.