we have done quite some improvements in the master branch of Riena in the last couple of month and weeks.
We now have integrated the e4 based development back into master. As a result we can built a Riena 5.0 Version that runs on Eclipse 3.x, Eclipse 4.x and on RAP 2.0.
All of this will of course be delivered in the next M7 milestone of Kepler but I recreated a pre-version for now that you can install into your target platform.
There are two p2 Repositories. One contains Riena for RAP 2.0 and Eclipse 4.x. Install EITHER the "RAP" feature OR the "Core" feature from there. Based on that you can install the "Samples" feature (if desired).