Thanks for the info, Krew. Also read that from Lexus JP web site.
It is a pity to see the newly designed and premium LED headlights are not available in North America. Not to mention premium LED headlights are actually standard in Lexus Japan's offering, ie. the downgraded LED headlights are for North American market (not sure the situation about other countries) for the sake of a lower MSRP.
I think it is a sad decision for Lexus not to bring the premium LED options to North American markets --- it is not uncommon to see people in F-Sport trim (before facelift) complain about the poor illumination from the twin LED headlights without the JDM fogs. Premium LED headlights appear to fix the issue while totally removing fog lights in IS (both F-Sport and regular) and providing better illumination on the road.
To me, as a owner of regular 3IS, I hate to see the removal of fog lights while not having premium headlights in the facelifted models. For my pre-facelifted 3IS, I found the noticeable difference if I turn on my aftermarket LED fogs (Bellof Sirius Boldray, in case if anyone cares) with the twin LED headlights. So without premium headlights and without any kind of fog lights in facelifted regular IS, illumination on the road may be worse than before.