My best guess based on no specific facts is that it will come in around 585HP with some variation of the LSA using the 2300 S/C instead of the 1900. Like I said this is strictly a guess and a wish on my part. Until the New York show in April, we might not know for sure. So step up and place your bets and lets see who comes in the closest to the actual horsepower.
Walk softly, carry a light saber and drive a ZL1!