Hi!
BTW -- does the Wikidata SPARQL endpoint currently support CONSTRUCT and DESCRIBE queries? I ask because you can use that as one of the many options for dump production.
Yes, such queries are supported, but using this for dump production is both not possible - since dumps are what the data in SPARQL service is loaded from - and very inefficient, we don't really need SPARQL server for that, it can be done with much simpler code.