In reply to Miroslav Glavic.

I know you didn't say middle of the year. I was saying that with WordsPress 3.6 which contains a default theme called Twenty Thirteen, it was released on August 1, 2013 two thirds into the year of 2013. Releasing the default theme just before the year switches over gives people a chance to use it for the entire year it's named after.

The only way 2015 will come out IN 2015 is if WordPress 4.1 is delayed which it could be since 4.0 was delayed a week or two.