Just been reading this post which is news to me. https://www.bimmerfest.com/threads/major-option-restriction-announcement.1420312/#post-13612082
The new screens on Z4s will not offer touchscreen capability with a $500 credit applied. Also, Backup Assistant will not be available.
Also mentioned is that the HUD is not available any longer:
"Please note that, due to supply restrictions, we are forced to remove option 610 Head-up Display for several models on which it was bundled within ZPP Premium Package. The affected models are base-engine variants of 2er Coupe & Gran Coupe, 3er, 4er Coupe, Convertible, and Gran Coupe, Z4, X3 and X4. ZPP will be phased out and replaced with ZP2 Premium Package 2, which contains all of the same content as ZPP except option 610. Pricing and Ordering Guides will also be updated shortly."
The new screens on Z4s will not offer touchscreen capability with a $500 credit applied. Also, Backup Assistant will not be available.

Also mentioned is that the HUD is not available any longer:
"Please note that, due to supply restrictions, we are forced to remove option 610 Head-up Display for several models on which it was bundled within ZPP Premium Package. The affected models are base-engine variants of 2er Coupe & Gran Coupe, 3er, 4er Coupe, Convertible, and Gran Coupe, Z4, X3 and X4. ZPP will be phased out and replaced with ZP2 Premium Package 2, which contains all of the same content as ZPP except option 610. Pricing and Ordering Guides will also be updated shortly."