quote form wiki
"It's been announced, but what is it? What is Pro Street? The answer is simple. Pro Street is pure street racing competition. The essence of the performance tuner and what he, or she, wants to be: the Street King.
So will the be a massive open road with tons cops and crashes and completely innocent drivers cruising the city streets getting involved in the mayhem? No. You will compete for the first time since the Underground series launched on real roads in real environments set during daylight hours from around the globe. An echo of classic Need for Speed taken to a whole new level.
This year will have a story like some of the previous titles but there will be no green-screen cut scenes or comic book Underground 2 type stuff this year.
What kind of races will be taking place on these roads? Well, the Need For Speed team at Black Box has come up with four race modes this year for Need For Speed, all inspired by the events that real street car tuners participate in. Grip (circuit), Speed Challenge (checkpoint), Drift, and Drag (yes, it's back!).
Grip racing is pretty much the same familiar circuit racing you've always known but enhanced the the amazing new Pro Street physics engine and damage model (which I'll discuss later). You drive around Grip tracks may differ thanks to the new ability to turn off Arcade driving assists, making the experience much more real.
Speed Challenge is being described as being similar to checkpoint races but not much has revealed at this time. I was told many variants of this game mode will exist. Enough to keep us busy for a long time.
Drifting returns again this year with several new additions. Its more real this time. You manage your own line, your won speed and your own angle using real world drift techniques, such as e-brake slides, power over, feinting, and even clutch kicking. Drifting uses the same physics model the rest of the game uses, not the super slide the older titles used. Of course there will be a Drift Assist to help you manage your line in case your not quite that Hardcore.
Drag is back after a one year hiatus and guess what? I'm going to leave you completely in the dark about drag. I'll just let you know its not an obstacle course.
Sprint and Speed trap are gone yes, but I'm told most Sprint fans will take a liking to the speed challenges and maybe Speed trap might be one of those many variants.
The customization of Pro Street has been greatly enhanced this year. You'll be able to customize your car with literally thousands of after market parts from real world manufacturers. This enables you to truly create purpose built racing machines for each of the games specific race modes. The garage size of the career mode I'm told will be increased to accommodate this since you will most definitely need much more cars this game.
Not only is the performance tuning greatly enhanced, but different after market parts from different brands will have different effects on you car. Exactly what those effects will be at this stage is still not clear. Once you install one of these performance parts you'll unlock its decal so you'll know that if a car pulls up next to you and it has some serious labels on the side that you might be in trouble. Deep trouble. But on the other hand, he might not have any labels.
So, say you built an awesome car, but you want to strip it down and build a better setup, but you don't want to lose the old one because the new one might not be so good. No problem, you can save you setups as blueprints. These blueprints will store the data of your car so that it can be retreived by you at anytime. You also be able to upload blueprints and share them with friends online. You'll even be able to put the newly redesigned Dyno to the test to see benchmark results of your blueprint." -
more with next post