Yesterday, Wikimedia Sweden (Sverige) and the Wikimania organizing team announced the official theme of Wikimania 2019: "Strengthening each other: Wikimedia, free knowledge and the Sustainable Development Goals." Michael Peter Edson, the co-founder and Associate Director of The Museum for the United Nations — UN Live, will deliver a keynote address.
You can read more in the announcement on the WMF website ! Further information can be found on the wiki. Also, feel free to share and retweet the Twitter post.