Late summer, the Cayman 2.7 could be available, 240-250 HP are rumored. A more powerful Cayman version is in development but it may take another year or two until Porsche considers to put it on the market...or not.

To avoid any "conflicts" with the 911, Porsche may consider to offer a more sporty Cayman S version first (without a power upgrade) and go for a more powerful version after the 997 facelift will be introduced. But right now, the "standard" Cayman is the only new Cayman variant which is almost 99% sure.