We had a slightly different experience with our daughter's kindergarten in the city of Zurich. The teacher spoke only Swiss German in the classroom, and in the primary school, although the written work is high German, there is still a significant amount of Swiss German spoken. That being said, the kindergarten teacher was incredibly supportive, spoke English with our daughter when she did not understand the German, and the school did provide additional German instruction when there were enough students in her class who did not speak German to warrant the extra lessons. When it was only our daughter the second year, the school no longer offered additional instruction (which was frustrating for us, but understandable from a fiscal point of view).
That being said, any German instruction is helpful. Some movies are available in both High German and Swiss German: http://www.amazon.de/Lauras-Stern-2-...0635803&sr=1-1