2006 will most likely be just a 2005 with minor upgrades. No AWD.
There is a redesign in 2007. Same LS2 engine but it will use a new Zeta-based platform.
This is what they are hoping for. GM is in a crunch and is cutting the labor force down quite a bit and is looking at cancelling RWD platforms due to lack of sales with the 04. I'm guessing if 05's sales aren't good or are worse, then the 2007 GTO won't happen.
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GenV GTP engine, 12" Brakes, CAI, 3" DP, HighFlo Cat, 180 T-Stat, Aeroforce Gauge, Front STB, Stinger Fiberglass hood, Reflective Graphics.