Completeley different career style, and plenty of cars to mod.
For each different race mode you will now need to customize a specific car for that specific event so instead of having 1 car you now need to have atleast 4, for the 4 modes drift, drag, speed, grip. All the cars can be customized to the max and you can unlock unique parts like in most wanted. Also if you get sick of the selection of cars, you can download more from the psn store. Drag racing no longer has traffic to get in the way and to make up for this perfect shifts are need and timing of nos has to be spot on to win the race, they have also added a wheelie moed in drag racing which basically means the person who wheelies there car the furthest wins, this mode is really awesome it always reminds me of the end of fast and furious before the rail way crossing. Grip mode is basically circuit racing, some of the events you are entered to get the best time others your fighting for the best sector record etc. Speed chalenge is a whole new event that the racer has to get the best postion or top speed to win it is, you have to get the right car for it or racing will be made a hell of alot harder, the cars stababilty is the key to winning because totalling usually happens on these races. Drifting is also improved it seems alot more realistic, horse power and torque is everything for these events keep a drift lasting the whoile race and the points will pour in, they have also lost the whole multiplyer thing instead its angle and speed that gives points.
Online you can make your own race day which features the tracks you wont and the cars and the aim is to stay at the top of the learder board and win.
overall the game is great it is missing some of the great stuff from the last games like free roam and police but all this is made up for by the new style of racing.