I'm almost certain Model S headlights are controlled through the CAN bus right now. I had an aftermarket Mobileye in my earlier Model S and it was able to control the high beams. Programming that unit involved pinging the CAN bus until it did what you want. I also am sure that this is not motorized. LED's are cheap. So they turn on in progressive steps.
Based on all of this, and the fact that the form factor of the lights looks identical, I would think that the LED lights probably WILL be available as a retrofit.
The bumper is another matter. Looking at the pics out of Germany, it is clear that the Frunk has also been redesigned to be like the X. This includes changes to the closure area. Now some of this I'm sure is because they had to incorporate the giant Bio Weapon stuff (trust me its enormous in the X when you see it ripped apart - I have seen it)
I am also certain that the revised front requires a new hood as well. Thus this will be potentially prohibitive. Not technically impossible but definitely closer to 5 digits than 4 in terms of cost.
With all of that said, I would buy the lights in a heartbeat if they were available. I would personally expect them to come in around a similar number to the original headlights as parts.
On my old car, I retrofitted folding mirrors. LTE, Center console, and was considering next Gen seats, but then just decided to get the 90D. No regrets - it is amazing. (old front.).
The improvements to the car right now, whilst awesome are nothing in comparison to the technological advances which happened when dual motor and autopilot shipped. imho.
Wow i was rambling there. sorry.