There has been so much money and time spent on battery research. We are in the incremental phase of battery evolution. There will not likely be any major leap in battery cost or performance.

A battery is a box of minerals with electrochemical reactivity, i.e. it can catch on fire if something goes wrong. More energy from the battery means more minerals, which means higher cost. More reactive chemistries can reduce mineral inputs, but tend to be more expensive or less stable.

Tldr; there are no quantum leaps available for batteries. If Toyota has a giant range EV it's either really expensive or it's a research vehicle staying far away from consumers.