It looks like Ghost Recon: Advanced Warfighter is going to be a true PC game, and not a kludge like GR2.
This is from an online chat with the devs from earlier in December:
[Peter] Apart from the most obvious - reconfigurable controls and higher resolutions - how will Grin make sure that Ghost Recon 3 won't be another Playstation 2-conversion running on modern PC hardware?
[Ulf] First off, content art, sound, technology and gameplay is entirely unique for the PC version. The entire PC version is made exclusively for the PC, and stand alone from the console versions in terms of gameplay. I'll go a bit further on this: First off: The tactical layer of the PC game is much more advanced than the console approach. We have a real time 3d view of the battle field where you as a squad leader can see the action and plan it real time. This to be able to set up the best tactical approach as the combat and pre-combat changes. Adding to this we have individual control of 3 team mates and other support troops. This to design complex flanking and attacking patterns both on the fly and through your tactical interface. It is really a tactical sim as you never have seen before on any format. Next we have a exclusively designed control on the PC that makes the player immersed in the body of Captain M. We are able to control him with great accuracy for both stealth, position in covers and shooting positions. This is what we call the advanced leaning system which allows 8 way leaning, sliding and even diving into cover.