More to come US Airways 757 improvements

I know the 757 is going in for ETOPS and winglets but are they installing the A330 seats and upgrading the cabins at the same time or as materials arrive? Seems practical to do it all at once and kill two birds with one stone.
 
I know the 757 is going in for ETOPS and winglets but are they installing the A330 seats and upgrading the cabins at the same time or as materials arrive? Seems practical to do it all at once and kill two birds with one stone.
US being practical? That would surprise me.
 
I know the 757 is going in for ETOPS and winglets but are they installing the A330 seats and upgrading the cabins at the same time or as materials arrive? Seems practical to do it all at once and kill two birds with one stone.
all at the same time.