Blizzard's international law firms have sent notification to OVH, a local French server host, and to those who administrate Nostalrius, a World of Warcraft private server, that documents are being prepared for legal proceedings if the server is not shut down. As a result, the administrators of the private server have informed their players that Nostalrius Begins PvP, Nostalrius Begins PvE & Nostalrius TBC will all be shuttered on April 10th providing the hosting company is willing to keep things open until then.
Those running the private server are offering to "provid[e] everything [players or guilds] need in order to setup your own "Nostalrius" if you're willing to". In addition, the Nostalrius group is asking its players to send and open letter campaign to Blizzard to "express ourselves as a community". According to the letter found here, Nostalrius ostensibly houses 150,000 active players and over the course of its year in existence, 800,000 folks have registered accounts.
Today is also the day where Nostalrius will start being community-driven in the truest sense of the word, as we will be releasing the source code, and anonymized players data (encrypting personal account data), so the community as a whole will decide the form of the future of Nostalrius. We will still be there in the background if you want us to, but will no longer take the lead.
Read the full community letter on the Nostalrius site.
Source: Massively