In future, release sources from client and server
Clord
It might sound weird and about 100% surely not gonna happen, it can be nice when something like year 2010, whatever original Guild Wars get source code released.
Xenex Xclame
I think they have already said that this would not happen, i believe it came up in a thread that was talking about how players would like to run their own servers later when GW has gotten old.