Lexus of Australia has confirmed that they will launch the RC series locally with RC350 and RC300h, with RC F as well as RC250 to follow the next year.
Thus, I assume all the engine variants available on the current IS sedan will be available on the RC!
I expect to see Lexus of Taiwan launch the RC series in Taiwan with RC300h and RC250, just like what they did with the new third-gen IS sedan.