Most long standing FPS titles are forced to go through a reinvention stage at some point. Like when the competition invents some new mechanic that must be copied, or when players are simply too tired of doing the same thing over and over again. Modern Warfare has changed the way the Call of Duty franchise looks and feels, the same way that Medal of Honor, Splinter Cell, and Halo have all been trying to revitalize themselves. But Tom Clancy's Ghost Recon series has been reinventing itself for years now, unlike the competition, and Future Soldier may be the fruit of all Ubisoft's labour.
Though the series has some consistencies between its games, the Ghost Recon games have always tried something new, and generally gotten away with it. While the first few games were not very inspiring when it came to AI, a lot of the team-based mechanics were unique at the time, and have only been refined since. In a way the Ghost Recon titles were ahead of their time, promoting teamwork and unity over single-handed heroics.
The series also has a lot to offer when it comes to vehicular combat, and though tossing in tanks and helicopters into every FPS seems to be a popular trend, Ubisoft can at least claim that their games have been attempting to refine vehicle-killing for a while now (at least through the use of squad combinations). Having to actually rely on competent AI to accomplish tasks is a big risk, but pulling it off does give off a great feeling of pride and camaraderie. Something you get in a lot of RPGs, but very rarely in a shooter title.
Now this isn't to say that the Ghost Recon series has revolutionized the gaming industry and singlehandedly changed the way FPS gaming has been designed. But there are a lot of really great aspects to the series (particularly GRAW 2) that have a chance to be further polished to a shine in Future Soldier. Even more important is the fact that we may finally see a first person shooter that doesn't completely orient itself around multiplayer, knowing Ubisoft's love of cinema. It'll be a nice change of pace for people who enjoy playing games offline once and a while, however few they may be.