Just to show that not everything in apple is ponies and rainbows, MacRumors is reporting that the new 13" and 15" MacBook Pros Have a Slower SATA Interface, using SATA 1.5 instead of SATA 3, which is what the previous "new" laptops had.
Whether this will affect "real world" usage or not has yet to be seen, but it would affect battery life (making it longer), by making the computer, slower.