According to a report in today's New Zealand Herald, the new series will be an endurance racing world championship. No specifics on types of cars, but some speculation is that it might be heavy on hybrids, which Porsche will soon have two models. Final word from FIA won't be until their December meetings. Expect races in Europe, US and Asia, all stong Porsche markets.
Regarding F1, Porsche's CEO is quoted as saying that F1 is not of interest to Porsche due to the cost and that it does not "offer enough in exchange" for the spectators, whatever the heck that means.
Sorry, but don't have a link to the small article in the Sept. 7 paper.