I stumbled on more than 20 websites and nowhere mentioned about the Android Jelly bean update for SAMSUNG Galaxy S Duos GT-S7562 device. I guess the version of android you are shipped along with the phone is later (Android ICS) or they might have received the slight improved version of Android ICS update.
XDA Developers also not listed this phone for custom ROMs with Jelly Bean features. But you may try rooting this phone and install any custom ROMs as well as CyanogenMod ROMs. But those are also similar to the Android ICS and you will lose warranty of your phone if you root it!
rooting info here: http://forum.xda-developers.com/showthread.php?t=1952743
If you don't want to void warranty, then wait for the official update notification pops up in your mobile screen, then connect your device to Wi-Fi and update the firmware.