Cynthialcy, you have probably already gotten this information, so apologies for the repeat (and sorry for the threadjack!) FUSD tests for GATE in 3rd grade; there is no GATE program before 4th grade. The good news is that they test all students, not just those nominated by teachers.
We saw mixed in-class differentiation, it was highly dependent on the teacher.
We pulled our kids (both DYS) before 3rd grade to homeschool. One DYS family I know also was unhappy with their experience, but another DYS family is fine with FUSD.
