If you are referring to the KitKat update, many manufacturers have not revealed any specfic rollout date for KitKat. Additionally, some devices will never get KitKat.
I have jelly bean 4.0 and I've never updated it since I got it in August. I went just to check and see if there was an update and got the message that I can't until I have update.zip in nand or as card.