The radar and some other features of the Hardware 4.0 FSD kit that Tesla installs on its new Model S and Model X batches may be missing from the upcoming Model 3 Highland facelift. Instead, it could ship with a Hardware 3.5 set more akin to what it now installs in Model Y units.https://www.notebookcheck.net/Tesla-Model-3-Highland-may-launch-with-watered-down-HW4-set-like-Model-Y-to-lower-price.742850.0.html
I can see the wisdom in avoiding Hw 4.0 extras to lower the base pricing for the model 2 but hope they will make it upgradable to future owners to add a couple thousand $$ of hardware to be able to implement FSD should they want it later on.