when do the freedom flight kits usually get released?
Typically early October, but it depends on how different the rules are that year. For example, a basic Wright Stuff kit may be available earlier if there aren't any novel bonuses thrown in.
So you are saying that this year's division B wright stuff kit could possibly be used for division C next year?
2017 events: Electric Vehicle, Game On, Robot Arm
2018 events: Mouse Trap Vehicle, Game On, Mission Possible, Experimental Design, Duct Tape Challenge
2019 events: Mouse Trap Vehicle, Sounds of Music, Mission Possible, Experimental Design, Wright Stuff, WIDI