Zack Snyder and Henry Cavill Discuss Man of… by filmjunkee
Snyder:
I think if we could get a good script it would be great to have a standalone Superman movie. I think that would be fun to do. Part of the reason we haven’t announced the standalone Superman movie was to support some of the events of (Batman v Superman).
Cavill:
I do believe it depends upon the success of this movie. If this goes well then we can start to negotiate with Warner Bros. to develop a standalone Superman, but they’ve got their plan set out for other stuff and Justice Leagues and various other movies. It’s about finding the time really. It’s something I would be very keen to do
Source: IGN