Yeah, you'd have to assume that Apple isn't putting a huge amount of storage on this thing, so I'm guessing the music on the go part is largely a matter of selecting playlists before hand.
Still, they've mentioned that the watch can use the new Continuity feature, so I imagine it will be super easy to move seamlessly from iPhone or Mac to Watch.
That which doesn't kill you weakens you slightly and makes you less able to cope until you're completely incapacitated
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