As we know the order guides list what is potentially available. The dealer configurator may add or subtract options on a continual basis. The PSE may have been available to order in Jan, but was not available when I placed the order. That may change before the production becomes finalized.  The dealer stated that while the March build is still planned, their PCNA rep has informed them that Porsche is constantly assessing production schedules and build dates may change. 
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Carpe Diem