Lexus has registered RC 200t as a trademark in Australia, fueling speculation that the new coupe will be offered with a 2.0L turbocharged four-cylinder engine. The RC 200t was registered on August 12, 2013 under trademark #1574017.
The 2.0L turbocharged four-cylinder engine was first announced in October 2012:
Starting 2014, [Toyota] plans to launch a vehicle with a new 2.0-liter, turbo-charged AR engine, also based on the 2.5-liter AR gasoline engine. The new engine’s smaller displacement will provide higher fuel efficiency while the turbocharger will improve output.
[Source: IP Australia] (Thanks mrxandthexfactor!)