The mouse all depends on user prefrence. If you're happy with the one on your MacBook, then you don't need a mouse. However if you find it lacking in something, feel free to buy a mouse, and as the poster above me said, you can use any mouse, you're not limited to the Magic or Apple mouse. I don't really see any reason to buy a magic trackpad for you, (Beside user prefrence) as you already have (nearly) the same one in your MacBook already. IMO, the Magic trackpad is more geared to iMac, Mac Mini, and Mac Pro users. All I can say is the old term, "Whatever floats your boat"
As per to iLife and iWork. That's the problem with Apple. No one knows, it's always rumor. However, if a new one comes out in 14 days since you bought your computer, you can get the new version for free. Otherwise, I'm sure it will be discounted otherwise for recent Mac purchasers.