Hello there hh1234, Mike
Having beta tested the Vista RC1 and later both beta and Release Candidate builds for Windows 7(32bit and 64bit) I have to agree with the explaination there. Each new version does require some place to start off from on the initial stages much like the early Alpha stages for Windows 7 were starting to materialize shortly after Vista's release back in 2007.
At first you would only notice a few minor items during the early development appearing as if you were still running the present not the next version to come. By the time the first available public beta release is seen most of the kernel and main gui have already been through most of the major changes to be seen while some last minutes items will still be worked on in preparation for the RTM release(RTM=Release To Manufacturing).
One thing I just reviewed about the next version to come will be it's "portability" as far as the corporate concerns according to one report of seeing W8 running on a usb flash drive as well as being a lot further geared for Tablet PC, netbooks, and other hand held portable devices as well as increased touch screen support.
Operating System Windows 7 Ultimate x64-Linus Mint Debian 32gb usb flash drives
OS Service Pack SP1
Internet Explorer Version IE 8 reverted back to
DirectX Version DX 11, DX9c
Computer Type custom
CPU Type and Speed AMD Phenom II X4 965 3.2ghz
CPU Cooling Zalmam all copper
System Memory Type DDR3
System Memory Speed 1600
Video Card Type and Speed MSI Radeon HD5750-internal DAC 400mhz
Video Card Cooling Stock
Video Card Temperature 60C
Power Supply Unit (PSU) Corsair TX750W
Computer Monitor Acer 19" pair
Sound Card Creative XtremeGamre
Speakers Logitech 5.1
Headset/Microphone Logitech usb
Hard Drive 4 internal 2 Sata II(WD Black Ed.), 2 Sata 3(WD Black Ed.), 1 external WD Green Power) all HDs 1tb
Optical Drives MSI dvd burners = 2
Keyboard and Mouse MS Recusa, MS Trackball Explorer
Modem-Router Type Motorola 6101 cable modem/router
Network Adapter Netgear 10/100 ethernet PCI
Printer HP Photosmart Deskjet series
Network Speed 12mb/ps
Anti-virus Software VIPRE Home Premium