It's no secret that the Japanese luxury marque is developing a coupe version of its new IS midsizer, but the company has yet to announce its coming.
Spy photos in recent weeks have revealed that the so-called RC is in the final stages of development, with light camouflage obscuring the production-ready model's finer details.
The model spied in recent weeks is believed to be the top-shelf RC F performance model, but according to industry paper Automotive News, it's the regular coupe that we'll see in Tokyo.
If that's true, we can likely expect Lexus to show off the high-spec RC 350 - probably in F Sport trim, one step down from full F status.
It's unclear what we can expect from the RC's engine range, although the IS 350's 3.5 litre V6 engine would undoubtedly sit at the top of the sub-F range.
The RC F, wearing a more intense styling and aero package than the regular models, is expected to debut later at January's Detroit Auto Show.
The source of power for the top-shelf performance model remains unclear, although it is understood that the current IS F's 5.0 litre V8 engine can not easily be made to produce more power while still meeting the strict new Euro 6 emissions regulations.
“To produce more power and torque it runs leaner. That is the problem. We probably need a new engine for the F model,” Lexus IS chief engineer Junichiro Furuyama told TMR recently.
While we could see a turbocharged engine in its place, Furuyama pointed to natural-aspiration as one of the company's strengths.
"Natural aspiration is one of our strong points... and is a more pure experience,” Furuyama said.
Watch for more on the new coupe to surface soon.