Ghostbusters 3 being rewritten

So hopefully this script will entice Bill Murray once again? Coming Soon reports that Etan Cohen (no, not Ethan Coen unfortunately) has signed on to rewrite the script.  He wrote Tropic Thunder, so this could be a good move. It almost has to be, right?
Also, Dan Aykroyd gives some info:

"My character, Ray, is now blind in one eye and can't drive the cadillac. He's got a bad knee and can't carry the packs... Egon is too large to get into the harness. We need young blood and that's the promise. We're gonna hand it to a new generation."