From this page you can join and browse the GCompris mailing list.

This mailing list is used by the developers and users willing to stay aware of what’s going on. You will get new release announcements. Users can join the list and report bugs, discuss feature they would like to have, ... The language is English. There is also a user mailing list in French and in Portuguese. If you want to create a user list in your language, please contact me (bruno.coudoin@free.fr).