The package is not yet hosted on CRAN.
But you can easily install the most recent development version of the R package as well:
What is it good for?
This provides a simplified DBI driver for Redshift:
Installing and loading the JDBC driver package is handled automatically.
What if I want to do other cool things with Redshift and R?
Most database functionality is actually provided by RJDBC, but if you have Redshift-specific features in mind, please open a ticket on the feature request, or even better, submit a pull request :)
It doesn't work here!