As a rule, the GSM i.e. Google (SIM-Free) versions get releases first, followed (sometime and much later) by the versions issued by the individual carriers. If you look at the US carriers track records you will note that many Yanks were moaning that they were still waiting for 4.1.2 several months after the GSM ROMs were updated. Whatever your (GSM) build, yakju or takju, you have access to and can flash the takju factory image of 4.2, which has been avasilable from Googles developer site for over a week now. The only difference between the two builds is that takju includes Google Wallet, which won't be enabled on your yakju anyway since your regional identifier is Non-US. The takju build ROM works perfectly on a yakju build. I flashed this last week but preferred my ParanoidAndroid ROM because of the customisations.
So, the moral of this story is you can have 4.2 already - just flash via adb or learn how to.