The Lexus LS+ Concept unveiled at the 2017 Tokyo Motor Show is one of the most self-explanatory show cars you'll find.
By saying that it indicates the "future image of the LS flagship sedan", Lexus is basically letting us know what to expect from the LS once an updated version comes along in the not too distant future.
Based on Lexus' L-finesse design philosophy, the LS+ Concept features an evolved Spindle Grille with a large grille shutter that aids both cooling as well as overall aerodynamics. It also comes with laser headlights and taillights, as well as electronic side mirrors.
The overall aesthetics of the LS+ Concept aren't all that different to the current, all-new LS sedan. The shape of the car is basically the same, with minor alterations here and there that make the concept look more modern, if not futuristic.
Also, if Lexus decides to go with a long light strip at the back on a future LS, it would only be following in the footsteps of other luxury cars like the Panamera, Audi A8 or all-new A7 Sportback - which wouldn't be a bad thing since that car would then look arguably better than the current version.
On the go, the LS+ would rely heavily on its "Highway Teammate" automated driving technology, which is also due for release in 2020. These systems allow the car to respond to actual traffic conditions on motorways, enabling automated merging, lane changes and diverging, while making sure you stick to your lane and hold your position behind the car in front.