During the majority of this time (the downtime is expected to last around an hour), FarmVille will be entirely inaccessible for ALL players. To put it bluntly, you won't be able to play the game. After the initial downtime, Zynga will start to open the game back up, very slowly, and only for a small amount of players, so as to confirm the game's stability after performing the background changes that are likely to be performed.
Don't worry - your farm will be ready and waiting for you (presumably unscathed) after the maintenance period is over (puppy hunger and crop wither will be turned off for a period of at least 24 hours), and hopefully, some of the bugs that we've been dealing with over the past few months will have disappeared in the meantime!
While you're waiting for FarmVille to come back online tomorrow, remember that you can always check out all the latest news on other popular Facebook games here at Games.com - The Blog! or you can always play another Facebook game - CityVille or FrontierVille perhaps?
What will you spend your time doing while FarmVille is down tomorrow? Share your FarmVille downtime plans with us in the comments.