You spent roughly $3,000 on a computer that had gone a year without an upgrade. Had you done a bit of research first, you would have learned that the Mac Pro was going to be upgraded soon.
There are three possibilities:
1. You didn't do any research and bought blind, in which case I have no sympathy for you since you should have found that out. You managed to find mac-forums.com; you could have asked a week or two ago (or when you registered in January) if people thought the Mac Pro would be updated. Instead you waited until after the fact to come here and complain.
2. You did know they were due for an update and bought anyway because you really needed the computer right away. If this is the case, then I'm sorry, it sucks to be put into such a situation but you have to make the best of it. I can sympathize but if you need the computer so desperately, wouldn't that make you too busy to go around pursuing legal action? Even if you get what you want, you'll have to go through the whole process of migrating your stuff from one computer to another and you may be without a computer for some time. So it wouldn't make sense.
3. You knew they were probably going to be updated soon but bought anyway because you just couldn't control yourself. If this is the case, please grow up.
I don't expect you to ever actually come back and read any of these responses, judging by the way you made two posts over the course of your ~6 weeks here, both about the same thing, and signed both of them with your real name for some reason, and then logged out immediately after making your second one. But if you do, read all these posts and see how many people are on your side.
Anyway you'd better get on that exchange thing quick. If you want to get a new Mac Pro so bad, pay the 10% (around $250-$300?) and do it. You can afford a Mac Pro, no reason you can't afford a restocking fee. That's how it works. You wanna play, you gotta pay.