For those interested, the README contains instructions on how to
install/test the current development versions of the plugin. In
contrast to Barry Rowlingson's experimental 'pqgisr' R package
approach taken by the GSoC project separates the 'server' side (plugin
providing programming language-independent interface to QGIS
components+data) from 'client' implementations (e.g. an R package
making use of that interface).
For the first two weeks coding has been limited to the plugin side so
there isn't much ready-to-use functionality yet, however if anyone
would be interested in testing early client versions and has any
suggestions/requests on what components/functions I should focus on,
such feedback would be most welcome!
I'm currently developing the plugin against the QGIS 2 API, but with
QGIS 3 in mind for easier conversion later on.