Oddly enough the "Fremont Union High School District"[1] is only high schools in the Sunnyvale/Cupertino area. The town of Fremont has a different school district. That said, I realize that new housing would impact schools, especially if people have kids. So far the number of new families who actually have kids that have been moving in seems to be a relatively small ratio (lots of couples who are both working and don't have kids). Its a good question to ask the city manager though. They probably have a handle on what the numbers look like.

[1] http://www.fuhsd.org/