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Because the people have spoken, and while most of it was complete gibberish, numbers don't lie. People preferred 4.0, and 4.0 it shall be. Unless somebody can come up with a good argument against it.
On an actual technical side, this was a *fairly* small release. By modern standards, that is. It's certainly noticeably smaller than some recent kernels have been, although we're talking ~9k non-merge commits rather than 10-11k, so it's not like it's that huge of a difference.http://lkml.iu.edu/hypermail/linux/kernel/1502.2/04059.html
The live patching infrastructure made some news, but my personal favorite features are actually some vm cleanups, where this release is getting rid of the largely unused non-linear remapping code (replaced with just emulating it with lots of smaller mappings) and unifies the NUMA and PROTNONE handling for page tables.