As of this writing, just over 7,800 non-merge commits have been pulled into
the mainline repository for the 5.13 development cycle. It does indeed
seem true that 5.13 will be busier than its predecessor was. The work
merged thus far affects subsystems across the kernel; read on for a summary
of what has been merged so far.

Source: LWN.net – [$] The first half of the 5.13 merge window