"could use a solid-state
"could use a solid-state battery pack" "Could" is the operative word here and it probably won't as the general consensus is that we are 3-5 years from SS battery adoption.
As for a CVT, nope. EVs (with the exception of the Porsche Taycan) all single speed drive vehicles. They MAY have a dual speed transmission but it is highly unlikely that they would invest in a unique transmission after writing huge checks to Toyota for the rest of the car.