Sadly, Lexus probably looks at this and realizes that a refreshed IS would outsell the Koreans combined just because of brand recognition, and is OK with that as an exercise in minimal effort. Q50 is rapidly becoming as irrelevant as Infiniti - not that Lexus is doing much better. Their 400hp engine has not done anything to buoy sales.
A refresh of a 7 year old car is 100% proof of thought saying, "Let's see what we can get out of this with minimal effort and investment." There is no real strategy or "be best in class" play happening at Lexus anymore from what we have seen.
It depends in which markets. In Australia I think the Stinger outsells all Lexus sedans together.
Besides Will1991, Ssun and myself, anyone else truly interested in a TMX/TMY BEV competitor from Lexus? It does have an un-utilized E-TNGA (Lexus equivalent) platform for its BEV offerings.
I prefer you say Audi e-Tron and the other coming e-Macan. I don't like the egg shape of the Teslas. Also, given the advantage of BEV chassis, I'd prefer a sedan over a CUV.
But I think we all agree, however sad the end of GS and IS might be, Lexus urgently needs a perfectly from ground up (not like UX 300e) built BEV sedan to compete with the TM3, the coming BMW i4 etc...