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AMD Ryzen support for Debian Stretch?

Now that AMD's Ryzen CPUs have been released, I'm wondering if they'll
be supported by the upcoming Debian Stretch release. I'm a bit concerned
as Stretch comes with Kernel 3.9 but Ryzen support was added to 4.10.

Is Debian known to backport hardware support from newer kernel versions?
Otherwise a custom or backports kernel would be required from the start.
Ryzen CPUs could become quite popular during the lifespan of Debian
Strech. It seems to perform fine for Linux applications so far: