Will Late 2013 iMac boot from Snow Leopard External Drive?

Hey gang-

Got a new late-2013 iMac for Christmas (yayyyy!!)

I plan on running Mavericks for day-to-day use, but there are a few old Power PC apps that I occasionally need to run. Does anyone know if the new iMacs will boot from an external drive running Snow Leopard? I have an external Firewire drive with Snow Leopard on it and I'm wondering if the new iMac will boot from it if needed.

Thanks!

Dave