Don't know what you mean by the "latest" Summon or Park Assist features. The 2016 Model S has both radar and USS, and can do Park Assist, Autopark, and Summon. If the car has AP1, the versions of Park Assist, Autopark, and Summon will be the same ones that were available in 2016. If the car has AP2 (introduced in Oct 2016 I think), you might be able to upgrade some of the hardware to get newer versions of those features, but I'm not sure.