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No, it is not ""that's still unfolding"". It is a published WHO report. The consequences may be unclear yes, so we do not spceculate indeed. -  
Well, then add EPA's conclusions. But that is no reson to omit WHO results. Now this: you say ""very recently"" ""recenticism"" ""still unfolding"" (quod non), ""we don't yet know if it has enough weight"" (WP:OR you ask?),  ""other sources like the EPA ... conflict"" (OR again, and why shold EPA not be in there?), ""Others are beginning to respond directly"" (are you a journalist?), ""some time to flesh itself out"" (wiki wait for what?). In general, you are only asking for time. Are you sure you have no WP:COI? -  "