Read this rumor a couple of years ago, about Tesla moving the next S/X to the 3/Y platform to save costs and more commonality. If true, its explains the prototypes of 3s having a larger battery and rumored air suspension coming to the 3/Y. Engineering work on the next S/X.
It is clear Elon doesn't want us speculating, and there is a risk in looking foolish if we speculate.. However, that isn't new territory for me.
The 100 kWh pack in the Model 3 is a software label, but it seems Green thinks an actual 100 kWh pack in the physical horizontal dimensions of a Model 3 pack exists.
In any case we have had plenty of speculation about a Model S/X refresh, Roadrunner
If the result of speculation is to sell more LR and Performance Model Y instead of Model S/X, Tesla can probably live with that for a while.
If an additional result of speculation is to sell more LR and Performance Model Y instead of Model 3, Tesla is probably on balance very happy.
Speculation 1 - A pack in the same horizontal dimensions as a Model 3 pack exists, and can accommodate 75-100 kWh.
That would be used for Performance and LR Model 3/Y and base Model S/X,possibly base Cybertruck - STD Roadrunner
Speculation 2 - If STD Roadrunner can't accommodate 120-150 kWh, a larger pack with the same basic architecture exists
That would be used for Plaid Model S/X, and Cybertruck variants... - BIG Roadrunner
Speculation 3 - the Semi might be 300 Mile - (4 X) BIG Road Runner, 500 Mile (4 X) XXX Roadrunner - 225-250 kWh....
This accommodates all but the Roadster, I would be great if it can use XXX Roadrunner, but I think a specialist pack is more likely.
Speculation 4 - Model Y has been designed and engineered to fit STD Roadrunner packs, Model 3 requires minor changes, Model S/X more substantial changes.
Model S/X will eventually take both STD Roadrunner and BIG Roadrunner packs, Tesla don't want us speculating, mainly because this isn't something they can do quickly..
However this speculation does optimise pack production:-
Fremont, Shanghai, Berlin - STD Roadrunner
Nevada - BIG Roadrunner, XXX Roadrunner.
Texas - STD Roadrunner, BIG Roadrunner.