Hey Mick,
That Northstar figure is the 3.75 inch figure that came out in 2015 (I think it was?). The boxed Alpha Flight figures were Marvel Legends 6 inch scale.
The new Northstar and Aurora figures I mentioned that are coming out, I haven't found them again online, but you could be totally correct in that they could just be repacks of the boxed set Twins. The photo that saw may have just been a bad angle too, because the figures looked bad to me.
Best,
Dana