Linux 3.15 [https://lkml.org/lkml/2014/6/8/70 has been released] on Sun, 8 Jun
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While the page is completed, you can read about Linux 3.15 in the following sites:
LWN Merge window, [http://lwn.net/Articles/592989/ part 1] and [http://lwn.net/Articles/594864/ part 2]