If we go back to the E-TNGA presentation, we can see several possible powertrain possibilities.
Under E-TNGA there are 3 front motor (small/medium/large) and 2 rear motor (small/large) designs. The only one we don't know is the medium front motor but competitors usually have a 110-120kW motor as an entry-level option.
On their presentation they show three AWD systems with small front+large rear, one with medium front+large rear, and finally two large. In all cases, the AWD systems are rear-biased. They haven't shown a front biased configuration yet.
A '300e' system consists of either a single large 150kW front motor (already in UX300e) or two small 80kW motors for AWD.
The '450e' could be 230kW (80+150). A 35/65 split should be pretty fun to drive.
There could be a '500e' with 260-270kW (medium+150).
Finally a '550e' with 300kW as the range-topping model, but it may be only paired with the full-size 100kWh battery.
It is a little disappointing they are not planning a performance powertrain with 400+kW. But first batch of E-TNGA addresses the mass market only. Performance BEVs might only come with more advanced battery and motor tech (like in the LF-30) later in the decade.
As for battery size, E-TNGA will stay with the 96s config (355V). Starting with 2p/192 cells with 50kWh, 3p/288 cells with 75kWh, and 4p/384 cells with 100kWh. On the presentation they show up to 5 of those 96s slices for a possible 125kWh variant. But the highest capacity they claimed for any planned product is just 100kWh.
We already know a mid-size SUV will use the 3p 75kWh config so the RZ450e will most likely adopt it too.