Since everyone likes to keep asking, we're going to be moving F21 to
3.17 when it's released . There is ample time before Beta to shake
bugs out and sticking with 3.16 until GA would simply mean we're
shipping a kernel that likely won't be supported at the time of
 Linus was originally hoping to release it this weekend, but I
believe a 3.17-rc7 will come out instead. We'll rebase when the final
release is done.
 We may still run this risk, depending on slips and such but at
least we'll be as current as possible.
p.s. F20 will get a rebase likely around 3.17.1 or 3.17.2. Be patient
or upgrade to F21. F19 is in zombie state and will track the 3.14.y
longterm kernels until EOL (which can't come soon enough).