Lightening up and zooming in on that teaser photo was..um...illuminating.
The tallish, chunky proportions of the original dark picture led me to believe I was looking at a teaser for an "RX coupe" on the GA-K (ES/RX large FWD) architecture. One look at the rear monitor side view picture promptly changed my mind. The short front overhang and generous gap between the front fender's rear edge and the forward most edges of the windshield and front door shout out GA-L quasi-front-mid-engined architecture.
It seems that interior screens prematurely or unexpectedly revealing unwanted styling clues are a thing now. Lamborghini's Urus SUV was prematurely revealed via such an interior monitor screen grab almost a week before its official reveal.
Another random question: if LF-1 Limitless is a smash hit and Lexus decides to add it to its product line, what badge would it wear? Would the current 3-row body-on-frame two-model lineup (GX and LX) give way to a single BOF entry, thus giving the GX or LX badge to this newcomer? Highly unlikely. The coupe styling implies a "C", while crossover calls for an "X". But CX or XC prefixes are out, given their being trademarked by Mazda and Volvo, respectively. SX? That might work, but a number of carmakers (Kia comes to mind) use that as a trim level. TX? Toyota/Lexus do own that one, but I'm not sure if it's live or dead at this point.