To clarify - the 767 slots I mentioned are only the very latest ones, however the last several years have been of similar seniority. You would have to go back to late 2002 to find guys who managed to get the last of the 'early' promotions onto the 767 - roughly 12 months as an S/O before becoming an F/O on the 767.
As for a ground swell of promotion as new aircraft are delivered - I'll believe it when I see it. Don't get me wrong - I will be happy should it eventuate, but I certainly won't be holding my breath...