The 4680 batteries don't themselves make the MY better. It's what they enable.
What makes it better is the structural battery pack with F+R megacasts. What's in the pack....enables all that..
The new v2.0 chassis is supposedly lighter, stiffer, and more consistent.
That would mean better handling and performance, and better fit and finish.
Whether Tesla has made the 4680 manufacturing breakthrough as yet, remains a question.
If not, then the batteries remain precious and MY car volume using 4680 will be limited.
That would suggest the "MY AWD SR" might be 4680 based, but for Elon having stated that all SR models are to be LFP-based.
It's all speculation until (hopefully) April 7. Maybe....