Wouldn't it be great if Windows 7 was designed to be more efficient than Windows XP? Vista was built with security in mind. Windows 7 is being built with performance in mind. Will it out-perform XP? With so many netbooks popping up, slower processors are being used to save costs and increase battery life. XP currently seems like the best OS for most of these devices (unless you're running Linux).
So what will Windows 7 look like? Will Microsoft actually release something that has lower system requrements than Vista? I doubt it.