I searched the forums but I didn't find any news about the fan made BS 2.5. I was astonished to find that the game has been available for download since the end of September!
So, quickly go to
http://www.brokensword25.com/ and download the game!
The game is done in the same style as BS1 & 2. The only drawback at the moment is the German voice-over work. The game does have English subtitles and the team is working on English voice-overs.
Enjoy!