He won't let people buy arma 3 for Dayz and then make a standalone and let the people who bought all of this for Dayz to pay 100$
And he didn't say anything about that, Arma 2 Dayz is the test for the standalone not arma 3.
Wrong, it's on the forums, the engine for Arma 3 is an upgrade for the one used in Arma 2, it was suppose to be tested & made for Arma 2 so it could be easily used in Arma 3, he has the sources for it.
He also works for bohemia interactive, why would it not be?
Check the forums.