There are reports going around that Microsoft has tweaked their Windows Update rules for the upcoming Creators Update so that certain patches will still be automatically downloaded and installed even over metered connections. This is a source of worry because updates could be large enough to be costly, but if you dig a little deeper, it seems that W10 has never actually blocked all updates over limited connections—MS merely clarified the text to make it more obvious.
…with Build 15058 pushed earlier this week, Microsoft changed the language of the Windows update tab in the settings page to the following: We’ll automatically download and install updates, except on metered connections (where changes may apply). In that case, we’ll automatically download only those updates required to keep Windows running smoothly. That last sentence would indicate that Microsoft will, for select updates, choose to ignore your preference for no updates over metered connections and push updates automatically. Given the hefty charges associated with metered connection, there are, of course, valid concerns over this being particularly costly to users.