I looked, was underwhelmed, didn’t from their little movie see anything one could not easily do with RCOM or cut and paste - but maybe it is early days yet.

From their website

Inference for R enables you to use the familiar Microsoft Excel and Word environment to assemble dynamic documents containing your data, R software objects, R commands, and text annotations (commentary). When executed, a dynamic document runs R commands and generates a results document that contains textual, numerical and graphic output of R commands in addition to formatted text annotations. Results documents are useful for documenting your R work, creating standardized analyses, explaining and illustrating concepts with R, and publishing and sharing your results.

Inference for R enables reproducible research and literate programming

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This paradigm is based on the ideas of literate programming and literate data analysis

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Inference for R is an alternative to R-project’s Sweave functions
R provides Sweave for embedding R code in LaTEX documents to create dynamic reports, which can be updated automatically if the data or analysis changes. However, to use Sweave functions requires a steep learning curve involving LaTex text formatting syntax and Sweave procedures.

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fwiw