Yeah, I second the "wait of you can", but I also got something new
All the little stuff you will notice except new G/CPU.
1: 8x DL SuperDrive in 15", is very probable in the next generation, and though it may not mean much to many people, it's a big difference 4x vs. 8x, and also the DL capability can come in handy.
2: Magnetic latch. If the screen is not too wobbly, Apple will most probably put a magnetic latch into the next generation. I love my MB latch! Though it takes same amout of time opening, it saves you a lot of time closing the lappy.
3: Trackpad on 15". If you desire to right click on the 15", you'll have to reach for the control key, and can't just keep two fingers on the pad, and then click. This is a little annoyance, that I would hate to have.
4: The extras. The next gen. may also consider many new sweet features. Who knows what Apple will come up with, but there might be larger HDD's, FW800 in the 15", better speakers/mic/iSight, brighter screen, ExpressCard/54 slot, 17" may be 0.9" thin and so on.
Conclusion: Wait...
