Studios are changing how they think about release dates wrote Molly Driscoll:

• The summer months used to be when audiences could expect to see the blockbuster action movies that drew crowds.
• This movie season though Star Wars came out in December – traditionally a fallow period– and anticipated movies like Deadpool and Batman v Superman are coming out well before the summer.
• This is in part because there’s less competition. The highest grossing films – Avatar and Titanic – came out in December, allowing them an unchallenged run in theaters for several months.
• Movie studios are also trying to compete against a golden age of television. Now top quality TV content is released around the year, and the movie industry is trying to keep up.

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Source: The Christian Science Monitor