linux-next:
git clone https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
cd linux
git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
git remote add linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
git checkout master
git remote update

git tag -l "next-*" | tail
git checkout -b my_local_branch next-20140625

https://www.kernel.org/doc/man-pages/linux-next.html # Working with linux-next