Flip Flop is pretty much right on, except no yanks flying with us, but lots with FAA lic.
For the person wondering about Direct Entry F/o's, yes they are always hiring and guys are always leaving, last ones hired were Greek, Dutch, Kiwi, Dutch, and the last Direct Entry capts hired were Greek, Can., French, however they are trying to upgrade whenever possible.
As far as getting on as an F/O I think they require around 2000 TT and time on type is golden and I don't think anyone has been hired who haven't had time on time.
As far as Metro relacements, the rumours seem to be just that rumours, until you see it sitting on the ramp and your ass is sitting in a groundschool believe it then.
Hope that helps