Hey everyone :)
Many people writing tools around Wikidata are using the standard XML dumps. They're not fun to work with. We're now also publishing JSON dumps. They're generated weekly at the moment. You can find them at http://dumps.wikimedia.org/other/wikidata/ The current one still has one little issue: We try to have one entity per line in the dump so it can be processed line-by-line. In the current dump there are a few exceptions. It's still valid JSON but not super nice. This will be fixed with the next one. I hope we'll see a few more cool tools developed thanks to this.
Cheers Lydia