I'm speculating here but here are some "facts" that I read here and there.
Giga Texas will begin production of the Model Y in October potentially with 2170 batteries.
2170 batteries production is at full capacity (or mostly) at giga Nevada
4680 batteries will be produced at giga Texas probably before the end of this year... more an estimate than a fact
Chip shortage will not be resolved or improved drastically over the next year.
Model3 SR+ is beginning to use LFP batteries in Canada and potentially in US in the "near" future
Considering all that, new production capacity from Giga Texas will result in a ramp down of production in Fremont due to chips shortage and potentially batteries shortage (Total north american capacity being limited). So once ramp up at giga Texas is high enough, it would make sense to shut down production lines at Fremont to upgrade to giga casting Model 3 since they can't easily increase production due to things that aren't under Tesla control or need time to solve. Does it make sense? If yes, it would mean that this could happen at the end of this year which would also explain why the model 3 went from November delivery to January delivery directly, skipping December. Would there be an overlap having Model 3 with the current design and Model 3 with giga casting?
So in a perfect world, it would mean that Model 3 would be on par with Model Y next summer excluding 4680 batteries that will be on Model Y only for a while...
Giga Texas will begin production of the Model Y in October potentially with 2170 batteries.
2170 batteries production is at full capacity (or mostly) at giga Nevada
4680 batteries will be produced at giga Texas probably before the end of this year... more an estimate than a fact
Chip shortage will not be resolved or improved drastically over the next year.
Model3 SR+ is beginning to use LFP batteries in Canada and potentially in US in the "near" future
Considering all that, new production capacity from Giga Texas will result in a ramp down of production in Fremont due to chips shortage and potentially batteries shortage (Total north american capacity being limited). So once ramp up at giga Texas is high enough, it would make sense to shut down production lines at Fremont to upgrade to giga casting Model 3 since they can't easily increase production due to things that aren't under Tesla control or need time to solve. Does it make sense? If yes, it would mean that this could happen at the end of this year which would also explain why the model 3 went from November delivery to January delivery directly, skipping December. Would there be an overlap having Model 3 with the current design and Model 3 with giga casting?
So in a perfect world, it would mean that Model 3 would be on par with Model Y next summer excluding 4680 batteries that will be on Model Y only for a while...