The recent deal between Israel and Hezbollah and statements by both Olmert and Nasrallah seem to strongly indicate that any prisoner swap will include Samir Kuntar, one of the most loathsome terrorists in history (despite Israeli denials.)
Kuntar, it will be remembered, murdered a father in front of his four-year old daughter before smashing her skull, among other atrocities. (And this sickening piece of human garbage is also considered a hero to Palestinian Arabs, with the "moderates" demanding his release.)
I am not wise enough to know whether it is worth trading him for Goldwasser and Regev today. I just want to point out that Nasrallah planned the kidnapping of Israelis specifically to get Kuntar in a swap, by his own statements. A prisoner swap would, as always, encourage more kidnappings in the future.
And if Israel would have had the death penalty for uberterrorists like Kuntar back in 1979, the incentive for kidnapping the two Israelis would have not existed - and the Lebanon war may never have occurred.