Are you in the MoP beta? I just opened that launcher and there is an update for that. It's only a bit over 500 MB, though.
I played regular WoW earlier today and didn't get an update, so I have absolutely no idea why it could be downloading 16 GB. You might try asking on the official WoW forums.
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Ahhhh, the vagueries of the aging mind. Wait.... What was I saying?
Carbonite <----- GitHub main module (Maps ONLY) download link. The other modules are also available on GitHub.
Carbonite-CLASSIC<----- GitHub link to Carbonite Classic. Thanks to ircdirk for this!
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