A new video has been released, get it here

There was also a recent interview done with the PC developers GRIN, here are some the important parts of that interview:

Differences and similarities
If you’ve played one of the console versions of Ghost Recon, you’ll on the one hand recognize locations and material, but on the other hand you’ll see differences.
The PC version was developed separately from the console versions, but is based on the same image and video material from Mexico City and of course on the same city map. The resulting game is much larger than the console version, resulting in longer missions.
We’ve received emails from worried people with questions regarding the stability of the game. Stability has a high priority at GRIN, because missions can last for several hours and you don’t want to crash just before a checkpoint. Using the official internet forums GRIN will try to stay in contact with the community, especially regarding problems with the game.

Support
This brings us to the patches. Every program contains bugs, even GRAW, something which Bo doesn’t deny. Patches will be released which will contain bugfixes as well as additional content.
Another point of frustration with the community is cheating. GRIN chose to develop their own anti-cheat solution, instead of using third-party tools like Punkbuster. The anti-cheat functionality will be updated with patches as well.

The last item discussed was the availability of modding tools. There will be a map editor available, and other aspects of the game will be changeable using the XML based configuration files.

Bo wanted to stress that GRIN will keep listening to the community after the release and that features might get added or changed based on the response.