Terminator 4 in 2009

I was really glad to hear that there will be an other sequel to Terminator.
So, Terminator 4 is waiting in the wing ! The movie should be released in 2009.

The question is: Will Schwarznegger appears Terminator 4?

Anyway with Governator or without, Mankind will for sure kick the machines' asses !

Here below the plot according to IMDb:

After the drastic effects of Terminator 3, the story continues as John Connor and soon to be wife Kate Brewster realize they must create a resistance organization with Earth's remaining survivors against the army of robots slowly being built up by Skynet. As they are building this resistance, one survivor happens to be a traitor in disguise, and has a secret that nobody would ever come to suspect.