I know I'm a little late with this, but anyway: the 4th NFS: The Run trailer popped up online earlier this week, showing a McLaren MP4-12C and a Pagani Huayra dueling on the Million Dollar Highway.

A few days before, it was announced that a demo for The Run will be available on October 18th for PS3 and X360; just like last year's Hot Pursuit demo, it will likely only be active for a limited amount of time. Sadly, there won't be a PC demo.
More info here.

Finally, NFS-Planet has published the following minimum and recommended specs for the PC version of The Run. Although no official word on this has come from EA's own channels yet, these system requirements probably won't be far from the truth.