Version number 9 is being skipped to distance the new release, conceptually, from Windows 8x. Microsoft screwed the pooch when they changed the start menu, start screen, and made touch-screen apps live in, essentially, a different shell than the desktop.
Business and industry won't touch it with a 10-foot pole - they're all sticking with 'good 'ol' Windows 7 for now - and you can't blame them. This is what happens when you try to 'wag the dog' on your user base - attempting to increase uptake of the touch interface by adding artificial restrictions to desktop usage. The user base revolts - you're not selling them what they need.
Windows 10 will bring back the desktop, and let 'Apps' live along side them.
I think the lesson is, don't cannibalize an existing market just to go after a new one, unless you're in the 'bling' business.
(This is why Apple can get 10 million apple-bot suckers to up for a new iPhone with a feature set we droid users have had for years. Bling is hard though, you've got to hit it out of the park every time or the luster wears off and people leave.)