This depends on how much the hardware inside the tesla to support the camera has changed, if they had to put in a whole new motherboard or ecu of some sort to support this camera. I doubt we will get a kit. and even if they did provide the kit. it wont be cheap. i think they charged like $800usd for the powered trunk kit for the model 3.
best scenario is that the current hardware already supports it, and it just a plug in and play after a software update or something. but tesla has always been finding ways to cut costs. good example being no power seats on passenger side on the older model 3 and Ys