I suggest contacting the school directly. If you don't have the school's telephone number handy (and if located in the U.S.), you can use SchoolFinder to research the school's contact info. Link to SchoolFinder included below.
At my daughter's school (in California), they don't announce teacher/classroom assignments until a few days before school starts. They post those assignments on bulletin boards outside the school office. Contact your child's school to learn their timing and process for announcing teacher/classroom assignments.
Below are some additional informational resources you may find helpful for Back to School. Thanks for asking!