I follow the patents and try hard to understand Apple's design reasoning and business decisions.
If you're waiting for something indistinguishable from modern ski goggles, it's around 3-5 years away based on patents (not just Apple's, not just VR) and prototypes you see at expos. Since I'm predicting, I might as well throw some other predictions out:
• Apple will update the current AVP in the meantime without changing it too much.
• Apple will only drop light-seal compatibility if they can get their adaptive/robotic lightseal to work (there are patents). This is critical as they could reshape the visor if they don't have to support older seals; the straps are easy to keep compatible. Personally, I think the bean shape was a big mistake, a U shape makes far more sense, but I understand why they did it.
• Light-control tech is exploding, partially due to R&D for optical computers (quantum and non-quantum) and some of it is applicable/specifically for AR/VR. A new generation of optical components to replace lens (and their deficits like energy absorption) is truly just around the corner for many industries. This will shrink VR and increase battery life.