Max De Marzi has covered lot of visualization with ruby language but
1) Integration of Neo4j with VivaGraphJS / D3.js out of the box to see the nodes and relationships in graph database will be pretty cool.
2) Integration of D3.js with cypher engine out of the box to see the query results visualization will be awesome too.
Tying the database to one specific visualization library out-of-the box is not something we will do, we'd rather see an approach where people build appropriate bridge libraries. However, the new Neo4j Browser GUI ships with a D3-powered visualization.