So after that very small rc2 due to the xmas break, we seem to be back to fairly normal. After a quiet period like that, I tend to expect a bigger chunk just because of pent up work, but I guess the short break there really was vacation for everybody, and so instead we're just seeing normal rc behavior. It still feels a bit smaller than a usual rc3, but for the first real rc after the merge window (ie I'd compare it to a regular rc2), it's fairly normal.
The stats look textbook for the kernel: just under 2/3rds drivers, with almost half of the rest arch updates, and the rest being "misc" (mainly filesystems and networking).
So nothing in particular stands out. You can get a flavor of the details from the appended shortlog, but even more importantly - you can go out and test.
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