The new G range will replace the current fourth-generation G25 and G37 models, which first debuted in G37 form back in 2006.
Spied testing in recent months, the 2013 G sedan will be larger than its predecessor, with power in the G37 expected to come from an updated version of the existing V6 engine.
A four-cylinder engine, sourced from development partner Mercedes-Benz, is also expected to be offered in some markets - likely replacing the 2.5 V6 in the current G25.
The current G37 Coupe and Convertible models are scheduled to join the Australian line-up next month, but Infiniti's local operation will skip the existing sedan in favour of the coming new model.
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