I spoke to tech services about this spec sheet months ago. I was told this was some R&D formulation and that no decision had been made about bring it to market. Honestly, I don't see the need for a 5w-40, ACEA A3/B4 formulation, since the 10w-40 already fits this bill and will be more shear stable. The 10w-40 also covers the motorcycle market, where this is a standard grade.
In addition since the 5w-30/10w-30 and S2000/S3000 already meet the ACEA, "A3/B3/B4" specs, there is too much product "overlap" to make the business case for a friction modified, 5w-40. No domestic gas engine calls for an SAE 5w-40, so it's a niche market, non-standard grade for a couple of high end Euro engines ....
The standard for commercial diesel engines is still 15w-40, and has been for the past twenty years. You won't see a 5w-40, CI-4 rated oil coming out of Superior, WI unless the standard changes from 15w-40 to 5w-40. I actually think what will happen is that a GP II+,110 VI basestock, 10w-30 will become the standard. The problem with 5w-40 is that it requires relatively expensive, GP III and/or PAO basestocks. So we are at least ten years away from 5w-40 ever becoming a standard for commercial diesel engines.
The S3000 was specifically formulated in a 5w-30 grade, instead of a 5w-40, to provide additional fuel savings and even better cold weather performance. The 5w-30 also complements the 15w-40's - PCO and AME - better than a 5w-40 would ....