It's just that apple got just what they wanted...everyone to be going all crazy about this machine as being "new" and what not. Its almost like apple is trying to trick everyone to make an extra buck.
Welcome to the world of marketing.
In my opinion Apple's branding went a little mixed up with the Aluminium Macbook. Aesthetics wise, it was just a smaller, lower end Macbook Pro. 8 months later they release an updated version of the Aluminium Macbook and rebrand it as
Macbook Pro.
Now we have the newest model Macbook, which feels more like an upgrade of the White Macbook before it went Aluminium. And the way they describe the new model on their page certainly feels like they're comparing it to the White model.
"It features a new seamless, more durable unibody enclosure..."
Hang on, the Aluminium case was seamless, durable and unibody.
"The new MacBook Multi-Touch trackpad has no button because it is the button. That means theres plenty of room to move..."
Yep, Aluminium Macbook already had that too.
The point I'm trying to make is that it is an updated, newly-designed laptop compared to the White Macbook. Is it completely different? No it is not, because how much variance can you have in laptop design? I don't think anyone ordered their "completely redesigned" Macbook and was disappointed because it still uses RAM and a built-in keyboard but doesn't have powerful lasers built-in standard.
"Completely Redesigned" is nothing more than a marketing tool. If you asked Apple what was redesigned, they would list all the things they already have on the website. New unibody enclosure, trackpad and a longer life battery. Not everyone would consider that completely redesigned, but hey, if it serves its purpose, it serves its purpose.