Some teachers are more or less willing to differentiate. Are there any advanced cluster classrooms? Those teachers are the most prepared to differentiate to a higher level. A teacher with a family member who teaches a higher grade can be immensely helpful since they'll have expertise to tap into.
Are there any other advanced students or particularly good friends? When teacher request time came around when DS was in elementary, we didn't request a teacher, rather, we requested he be placed in the same class as a specific student.
Another consideration would be looking for a teacher who embraces innovative seating. Some teachers are early adopters of exercise balls, bean bags, etc *in place of* traditional classroom seating. This might be ideal for your child also.
Keep your eye on ADHD type behavior. Simply adding structure can backfire - especially if above-grade level work doesn't pan out. More structure tends to equal more opportunities to get into trouble (and increased social problems).
