Based on the following facts:
1. Elon specifically said a while back that MX's autopilot hardware is a step beyond what is currently shipping
2. No camera changes were present on delivered cars on Tuesday
3. MX web site rendering has what looks like at least a bi-optic camera in the photo; at minimum it is different hardware than was seen in the delivered vehicles
4. Photos exist of test mules with tri-optic camera:
Here's my hypothesis of where we are on autopilot:
1. Next version of autopilot hardware uses a bi-optic or tri-optic camera
2. New camera is not yet integrated in MS; Tesla did not want to announce it with MX, thereby convincing people wait on MS purchases
3. Tesla did not want to hold up the MX launch over this, instead will retrofit them later for early deliveries
I think there's a reasonable chance that the new camera will be retrofittable to all autopilot vehicles, the key assumption being that the older wiring harness is capable of connecting to it.