Dear comrades, I just learned of a system based on MediaWiki which shares many of the same objectives as Wikidata: collaborative data storage and analysis, tracking of provenance, and facilitating citations, to name a few. I'd like to encourage a dialogue with these scientists, I do not think they are aware of your initiative, and they definitely have valuable practical experience after seeing the real-world use of their system. Currently they are managing several petabytes of data.
Research paper by the site creators: http://opensym.org/wsos2013/proceedings/p0301-sowe.pdf
Sorry I cannot link to their site itself-it might require an account...
-Adam Wight