1. A system for rendering individualized assets in video productions generated according to rich storyboards, the system comprising: a storyvine storyboard subsystem having a plurality of rich storyboards stored therein, each rich storyboard defining production specifications and a sequence of storybeats for use in a plurality of video productions, each storybeat comprising a set of storybeat assets, a first portion of the storybeat assets being shared storybeat assets associated with shared asset data, and a second portion of the storybeat assets being individualized storybeat assets associated with the asset acquisition specifications; and a storyvine render subsystem that operates to: select one of the plurality of rich storyboards as an output rich storyboard, such that the output rich storyboard defines output production specifications, output shared storybeat assets, and a plurality of output individualized storybeat assets associated with output asset acquisition specifications; associate at least one of a stored plurality of individualized asset data with each of the plurality of output individualized storybeat assets in accordance with the output asset acquisition specifications, wherein each of the stored plurality of individualized asset data was previously acquired by an asset acquisition interface according to the asset acquisition specifications defined by a respective rich storyboard; and render an output video production according to the output production specifications, such that the output video production comprises the associated ones of the stored plurality of individualized asset data in context with the output shared storybeat assets.