Do you know anything about this? I'd like to write some mods but I can't dig up any information about the addon support. Some say that it is not planned. Any information?
Currently, Guild Wars 2 does not support addons, and no official announcement has been made by ArenaNet as to whether support for addon development will be added in the future.
Here is a quote from Eric Flannum, who is the lead game designer for Guild Wars 2 (from December 2011):