You will likely first see attempts to "tune" existing drive inverters, as motors likely have some reserve. Probably also reconfiguring the thermal protection, etc..
In principle, the existing motors have some headroom.
There is a question of actual need though. This will be more of a topic for less potent electric cars, where tuning will be as big or bigger than wit ICEs.
In some cases also allowing to use greater capacity of the battery, say in
a Volt, currently allowing some 60% of actual battery capacity to be used, pushing that to over 80, should the driver need that, while taking some of
a hit in terms of battery life.
But AC drive trains have lots of safe reserve, if the temperature does not exceed the
temperature barriers beyond which the separator layers in motor winding would begin to melt.
Typically that is above 180 or 200C...