Quickly on the heels of 2.5.0 I'm releasing 2.5.1. This is mainly to fix an issue that caused the Editor->Syntax preference page to not open.
This release also add the possibility to change the font and colors of the tooltip in the editor (under Preferences->General->Appearance->Colors and Fonts, Haskell). It also searches for executables under $HOME/Library/Haskell/bin, which seems to be a path for executables on MacOS.
Also, some UI enhancements for Eclipse 4.2. The full release notes are here.
To upgrade just point your Eclipse to http://eclipsefp.sf.net/updates. Report any issue to the SourceForge forum.
Happy Haskell Hacking