The official site is here. The website is still under construction and I don't know exactly what will be featured.
FIDE's website will broadcast live games and video coverage. I don't know if the video coverage will include live commentary (which is usually worth the time) or if it will just be a camera trained on a game (which isn't worth the time; sorry, but watching Magnus Carlsen play chess in a silent room isn't really any more exciting than watching me play chess in a silent room, but I can guarantee that Magnus will play better chess than I do). There will also be computer analysis of the game posted, the engine will probably be a version of Houdini.
For a good idea of what FIDE will present, here is the FIDE coverage of the World Women's Team Championship, currently being held in Astana, the capital of Kazakhstan. I haven't been watching the games in Astana live because they start around 3 am Pacific time.
If one wants to watch computer analysis and chat with other players while some expert commentary is blogged, the best site is the ChessBomb Arena.
Finally, for a good time watching the game with comments by people who play the game at various levels, from beginner to grandmaster, the best site is ChessGames.