Hi there, we've posted a number of example static and interactive visualizations here: http://vega.github.io/vega-editor/. A schema for a Vega JSON specification can be found here: http://vega.github.io/vega/vega-schema.json. More information about the Vega toolkit specifically can be found here: http://vega.github.io/vega/.

Vega-lite is currently under development, but some initial examples are available here: https://uwdata.github.io/vega-lite