Hi,
Don't wait for Patek Philippe for that kind of gimmick! 
They would do it only if they had no other solution IMO, i.e. if they couldn't fit a circular second on a busy dial, but that's quite unprobable.
You can get a retrograde date on a 5159 if you want a retrograde hand, that's something!
The retrograde seconds is an Agenhor module used by various watch makers, so you can find someting nice with it for a very low price.
Cheers
Dje