My "gut" tells me that Porsche pulled the PSE option for the 987 because they did not want to "steal any thunder" from the Carrera!!

I don't have any proof, just a hunch.
The price for the PSE in the Boxster was $2,100. The Carrera gets $2,400. That's why I don't believe it was a typo...because it appears thay got the price correct!