Well, 150 guys is not a confirmed number, just the rumors over pprune.
And I don't think it really matters how many of them are Boeing experienced. They mentioned long before that the Airbus guys were given priority because of the CCQ into the 330 but nobody said that now they're going priority to Boeing guys.
As someone mentioned before in this thread:
I asked HR what would determine start date assignments. The response was that it would be based strictly on selection date completion- first come, first serve.