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Twin scroll refers to the exhaust channeling before it reaches the turbo. Exhaust is produced in phases based on the firing order on the engine. In a twin scroll turbo, the exhaust manifold is routed in such a way to optimize exhaust flow from the engine so that the turbo is receiving an optimal amount of exhaust flow (I.e. optimal would have the turbo receiving exhaust flow 100% of the time instead of in phases).
The S55 will function in the same manner the n54 did. Two exhaust manifolds that connect to two turbos. So expect to see something to the effect of turbo one fed by cylinder 1-3 and turbo two by cylinders 4-6.
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