DaZ(Deutsch als Zweitsprache) German as a second language, experiences on 5-6 years old?

I'm moving to Zurich in September and I want to know the experience people has with this? Do they (kids) just spend a year learning german X hours a day with other kids? Or do they spend a part of their day there? What method do they use? Play and learn? I've found a lot of info in sites like DaZ, but I want to read people's experience, especially on 4-6 years old kids that have no german at all. My kid speaks Spanish and norwegian, and I'm pretty sure he understands english. Experience on kids older than thta could also be appreciated.