Just a speculation.
DCS will become in the next few weeks 3 new modules. Sabre, Dora and Mig. I except the price of all of these aircraft will be around 40-50$. The colectors will buy all three i think but many people cant spend 150$ at once or in a single month. Therefor they will buy only one or two. And here is my speculatuon. If this situation ocures many people will buy the mig and sabre with dora will become bad sale rates. That isnt the way ED can go. So they bring on first the modules with are not as excepted as the mig is and only after that the mig will be here.
edit. The video is amazing.