Sometime in the coming weeks, Microsoft will tell Windows 8 users whether they will have to pay for the upgrade code-named "Blue," and if so, how much.

While Microsoft remains tight-lipped on the subject, analysts believe Microsoft won't charge for Blue, but may do so for later updates.

"I don't think that in the current Windows 8 climate they can charge for the first update, as the perception of many users will be that any changes being made or features they are adding will make Windows 8 the way it should have been when they first purchased it," said Michael Cherry of Directions on Microsoft. "I know I'd be upset if Microsoft asked me to pay for this set of changes."

Brett Waldman, an analyst with IDC, agreed. "I find it hard to believe that Microsoft would try to monetize Windows Blue," he said. "In my mind, it's more like a service pack-plus-feature pack, which have always been included with the purchase of a license."