Academics in Kindergarten
I'm not sure about other areas, but the schools in Whittier have all transitioned from half-day to all-day kindergarten in the last several years. They were just phasing in the day-long option when my daughter Clare (now in 7th grade) was in kindergarten -- it's no longer optional.
When I have substitute-taught kindergarten classes, I have seen some that included a little playtime besides recess, and some that expected them to sit still almost all day with lots of worksheets. All of them included at least some worksheets, and only the best explicitly set aside extra time for play inside the classroom.