Trixyb,
If you are on a stock rom (in other words what the phone came with, presuming you didn't buy it already fiddled with [second hand for instance]) then it will receive an update OTA (over the air), or you can get it through Kies. Sometimes the OTA servers are so hammered that when you get the prompt to update, you can't. If that happens fire up Kies, which in my short history with the phone, will usually get it and then install it via USB.
If you use Kies it's worth doing a backup just for your piece of mind before you update. Just a tip, I have never back up my apps with it as it never seems to work and it's get stuck backing up certain apps.
You can check for updates by going to Settings>About Device>Software Update>Update (presuming that's an option). Or plug it into Kies. Or wait for the update prompt on your device.
As for the 20th October...where did you hear that?