4.0 freeze soon - please limit big new features

[Augie Fackler]

Hey folks,

We're a little behind on reviews because of the sprint and a couple of
other factors, and the freeze is coming up on the 18th. As such, we'd
appreciate it it you could hold any (new) large series for after 4.0
is done, so we can get caught up and have bandwidth for the bug fixes
that are needed between now and November 1.

Thanks!