It's most interesting you're aware of the corporate motivations. Guess you must be on the BOD?-MilesAhead
f0dder doesn't have any crystal ball or inside track on information. When the public beta cycle for Windows 7 was announced the motivations (corporate and otherwise) were prominently announced on various blogs of the Windows 7 development team members.
All I can tell you from personal experience is that I'm running Windows 7 on a four year old computer with a graphics card that is at least four generations old and this OS is running better, smoother, and faster than any version of Vista or XP ever did.
I can also tell you that which version of Windows 7 that is installed in the beta versions so far released is mandated by the contents of an .ini file. People have hacked the .ini file and installed the home flavors of Windows 7 with no difference in performance. The only differences from the Ultimate install were missing features (which is understandable and by design) and the Ultimate serial numbers don't work on those versions (which is also understandable and also by design).
Unless one has a vertical app that requires a special version of Windows or is deadset on living in the past (OMG! Classic Mode is gone! [darth vader voice] Nooooooooooooooooooooooo! [/darth vader voice]) most people are going to be very happy with the new OS.
And to give you a personal perspective on my words, I really, really enjoyed Windows XP when it was released, but when Windows Vista came along I was very ambivalent about the whole Vista experience.