I've just released EclipseFP 2.6.2. This is mainly a bug fixing release with a better handling of cabal sandboxes and related functionality. It wraps also an important change in scion-browser, which should now mean that Hoogle uses all the packages present in your sandbox, so should give better results.
Browse the release notes!
Install by pointing your eclipse to http://eclipsefp.sf.net/updates.
This release is brought to you by me, myself and I. I would love to see more people contribute, even if only to install the development versions to provide some testing before the release, or write some documentation. There's work that can be done on the Haskell side, on the Java side, etc. Contact me if you're not sure, or send me pull requests! The code is at https://github.com/JPMoresmau/eclipsefp, https://github.com/JPMoresmau/BuildWrapper and https://github.com/JPMoresmau/scion-class-browser.
Happy Haskell Hacking!!