According to Mag-X, the more commodious RX will feature the same 2790mm wheelbase as the five-seat RX currently on sale. To accommodate a third row and two extra passengers, the RX L will have a lengthened rear overhang.
All up, the RX L is said to be 5050mm long, up 160mm from the five-seat car.
The Japanese publication believes the seven-seat RX will retain the five-seat model's rear window graphics, which might mean rear seat passengers will have a restricted view outwards.
It's understood the seven-seat model will be offered in RX450hL trim, with a hybrid drivetrain pairing an electric motor with a 3.5-litre V6. An earlier report indicated the crossover will also be available without the hybrid components in RX350L form.
Above and below: Lexus UX Concept.
The UX will be the smallest Lexus crossover to date, and will slot in underneath the NX. Likely sharing a platform with a the Toyota C-HR, the production UX will have a design that's heavily inspired by the 2016 concept car from last year's Paris motor show.
Expect the out-there interior, holographic displays and frameless windows to be thrown into the design dustbin, but the concept's proportions and heavily creased accents will likely remain.
The UX concept is 4400mm long and rides on a 2640mm wheelbase. For comparison, the NX has an overall length of 4630mm and a 2660mm wheelbase, and the Toyota C-HR sits on a 2640mm wheelbase and measures 4360mm from tip to tail.
Neither of these two models have been confirmed for the Australian market, but Lexus' local arm has already expressed its interest in the UX.
In January, Peter McGregor, Lexus Australia's CEO, told CarAdvice: "We will consider any product, be it a model or a driveline, that we think will actually enhance our customer needs.
"If we believe there is a customer demand for that in Australia, then we would certainly be putting our hand up for it and asking for it to be introduced in Australia."