Now right off the batt, the obvious sentence coming out of your mouth would be "How does it compare to GT5?". Now in my opinion, graphics wise GT5 is still superior but Forza 4 still looks gorgeous in terms of graphics.
I haven't played a Forza game yet so I don't know how the driving feels. However, there will be a smart AI mode where you essentially train your driver. There will also be Kinect compatibility so what they claim is that Forza 4 is playable for any age group. Kids can use the easy Kinect controls, the more hardcore players can use the controller for more precision and can dive into car customization and all that jazz.
None of us here at TMG own a Xbox 360 at the moment but I can say that I am excited about Forza 4. This game will further fuel the flames of the PS4 vs Xbox 360 fan boy war.
On a side note, I hate how they used the word "Epic" in this trailer. It's things like these that ruin the word.