Hello,
For 2005, their is to only be the introduction of a moon roof as already stated, and some emblum changes on the exterior.
The biggest changes will be for the 2006 model year. Their will be a refreshment of the interior, new introduction of the 6. 1 L. V-8 gas, Rumored Mega Cab or extended crew cab.
Those are what I've heard so far. But, of course, nothing is set in stone!
Mark