Hey,
I just wrote down a small into into our phase 3 components: http://www.bn2vs.com/blog/2014/05/06/the-wikidata-phase3-software-components...
This was written so I could also cover our migration to Doctrine DBAL: http://www.bn2vs.com/blog/2014/05/06/wikibase-and-doctrine-dbal/
Cheers
-- Jeroen De Dauw - http://www.bn2vs.com Software craftsmanship advocate Evil software architect at Wikimedia Germany ~=[,,_,,]:3