There are new batteries and new motors with silicon-carbide semiconductors.
Earlier today, Toyota and Lexus debuted some improved and some new electric vehicles. The event was focused on the European market, where battery EV penetration is relatively high, and I wouldn’t expect either the Urban Cruiser or C-HR+ crossovers to show up on sale in the US. But we’ll likely find the upgrades to the Toyota bZ4x and the closely related Lexus RZ, or at least some of them, in North American models at some point.
The revised bZ4x will come in three powertrain options, at least in the EU, all with new battery packs. There’s a 165 hp (123 kW) front-wheel drive version coupled to a smaller-capacity 57.7 kWh battery pack (which I would not expect to come to the US), and then 221 hp (165 kW) FWD and 337 (252 kW) all-wheel drive options, both of which use a new 73.1 kWh battery pack.
For comparison, the bZ4xs that went on sale in the US several years ago are offered with either a 71.4 kWh pack for FWD or a 72.8 kWh pack for AWD versions.