Linus Torvalds released 3.12 on November 3 2013 after seven 3.12 rc cycles. This time around, instead of opening the merge window right after the release, Linus chose to delay it by a week. The 3.13 merge window will be open on November 10th. In this release announcement, Linus started a discussion on bug-fix only 4.0 idea. The switch from 3.x numbering could happen roughly a year from now, after 3.19 or 3.20 is released. There is a desire to not let 3.x release numbering get too large. Hence, very likely after 3.19, major release number will be changed to 4.0
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