The Excellence, debuting at the Guangzhou Auto Show later this month, will be built in China and exported back to Europe and the USA.
A feature is the absence of a front passenger seat, to provide a main passenger with more room.
It will only be sold with the Volvo plug-in hybrid powertrain familiar from its availability in the XC90 large SUV.
A separate LWB version of the S90 will precede the Excellence version, which will accommodate the usual number of occupants for a car of its size.
