When we had a price adjustment, Tesla repriced each item on the order at current book value, then adjusted to the lowest whole order price - for some, that meant no price decrease, ie when white and black colours swapped free/chargable.
Tricky one on the supercharging. Its possible that they will honour the price reduction and he free supercharging although they may well not. The spec of our car changed between order and delivery, but they did honour original spec (retro fitting homelink and supplying mats for free) and lower price which I thought was very good. However, like many early orders, our delivery was very much delayed so it could be thought of them keeping us sweet.