The Current Development Kernel is...Linux-next?

"Linux-next is a somewhat strange base on which to try to develop, though. It is built anew every day from over 100 subsystem trees, each of which can, itself, change from one day to the next. So linux-next is a moving target, just like the mainline is. But, unlike the mainline, linux-next has no consistent or coherent history. Every day's linux-next tree is a completely new creation with a unique - and transient - history."

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