[6.0.0 Release] Scheduling the release

I see this as a positive move. As most people prepare to go into
end-of-year mode, they take less risks and commit less experimental
code. After the year begins again, people start taking more risks. The
closer we branch to the beginning of the year, they less experimental
half-backed stuff we'll carry on to the new branch and the less
reverts we'll have to do.

FYI heartbleed was commited at 11pm, December 31st: