I'm pretty certain that the answer is "no" based on what I've seen. The classic (regular?) edition is v3 of what you're using now, and the extended edition looks like it adds stuff from AfterFX to Photoshop.
Printable View
One workflow consideration for extended would be for some automotive photographers. An advantage is supposed to be that a 3D rendering of an automobile could be dropped into a 2D scene. However, I don't have really good details on this yet. I will be attending an Adobe seminar tomorrow on the entire Creative Suite. If I find out something more of interest, I will pass on the information.
Ciao!
Gordon Moat
A G Studio
I got the impression that you could actually import a 3D file modelled in something like LightWave (my 3D tool of choice :)) and render it IN PS3 Extended. It will be very interesting to read your report on it and find out for sure. :confused: