No, no extra levels. But there was one part in the first level where, if you didn't have the EP, it was split into two sections and you only get switch the different sections when the mission moved you there. If you had the EP, you could fly freely between the two.
The fighters were also slightly more detailed and clearer. Without the EP, the X-Wings wings looked pixelated. The wings would in the "down one left one" kind of diagonal pattern... The EP fixed that.
The differences aren't huge if you just start playing with it, but if you play a level with the EP, go ot menu and turn the better graphics off, then play that level again its noticable.
*shrugs and walks away*
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