S2 rear suspension geometry change

So... what actually IS the suspension geometry change from S1 to S2? What exactly did they change, and what was the effect? I get that there were parts changes, and that the intent was "better stability" or "better handling." What exactly does that mean? Different camber/toe curves? Higher/lower roll center? Less excess movement? I'd have thought someone would have figured this out and posted about it, but I can't find it anywhere.

The only hint I've found so far is this, from the PDF attached in this post:

Quote:

Overall driving stability is also increased with a reconfiguration of the rear suspension geometry and by increasing the size of the upper lateral link’s joint section by 7.5 mm for better control of toe-out change at rebound.

Kind of suggests toe control was the point. But the wording makes it unclear whether that extra toe control comes just from the beefed-up upper lateral link or from the geometry revision as well.

Anyone have any input on this? Is there an authoritative source somewhere that I'm missing?

S2 rear suspension geometry change