Revealed as a thinly-veiled 'concept' earlier this year, the RLX will replace the outgoing RL, which is sold in Australia as the Legend.
As a near-premium but ageing model, the current Legend - launched in 2006 - is the closest Honda comes to rivalling the likes of Lexus, Infiniti and a host of prestige European marques in Australia.
The new Legend may not share the RLX's styling, however: unlike previous generations, new Acura models have shown that while platform sharing will continue, the luxury marque will get its own unique styling.
The new Legend will likely get its own look more in-line with the regular Honda range. How it will differ is unclear though, with the RLX concept already draped in very Honda-esque lines.
Power for the new RLX is provided by Honda's new 3.5 litre V6 engine, mated to a seven-speed dual-clutch transmission.
Combined with the latest version of Honda's Super-Handling All-Wheel-Drive, which now features three electric motors, the RLX delivers around 280kW.
A front-wheel-drive version of the new RLX will also be offered, with the V6 engine alone delivering 231kW, bettering the 226kW of the current 3.7 litre engine.
The RLX features a wheelbase that is 50mm longer than its predecessor, with track and width unchanged. Large 20-inch forged wheels prop up each corner.