The firm tweaked it so that your PC doesn't automatically report in to Seattle Central every time it reboots, like it did before. If you had auto updates set on your XP, you might never have realised this.
Some people got a bit upset when they realised that, and so Microsoft relented.
The Vole has even produced a page which tells you how to disable or uninstall the pilot version. Except the page, here, says the instructions haven't been tested. If you want to twiddle around with the Registry then be it on your own head. µ
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