Well, WMA is going to be a free upgrade, and for the forseeable future, I think that all their software upgrades will be free. The only reason the word "almost" is on the page is just as a loophole in case things change.

I don't expect that they'll "suddenly start charging" for upgrades. If anything, a fee-based add-on would be some kind of a software plug-in, and it would only happen that way if there was some technology that required a per-user license to be paid back to the licensor.

So I don't think you have to worry about paying for your upgrades.

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Tony Fabris