Changing names just because they're changing powertrains is one of the stupidest brand/marketing/product moves I've ever heard of -- and that includes Lexus who appears set to drop all of their legacy names for new ones.
Buyers, shoppers, families, friends, coworkers, etc. know "A4," "A6," "Q5," etc and have the expectation that as those product lines evolve, they include new powertrain options. "New A4" is a much easier case to make with buyers than "We have a new compact sedan that's now electric-only, and we call it A5, but it's basically the same as the old A4, we just decided to change what we call it."
An S class is an S class whether it is ICE, PHEV, hybrid, or something else. Same for C, E, 3, 5, 7, Corvette, etc.
Some brands would KILL for the brand equity of "A4" or "A6" or "GS" or "LS" and yet Lexus, Audi, and others are eager to throw them away. I don't understand it.
Look at Infiniti, Cadillac, and Lincoln: their lineups have had so many different names for the same models that even enthusiasts can't keep up with what they're called or which new model replaced an older model, let alone buyers.