No, you need to specifically build a kernel for it. It's not enabled in GENERIC.
gpatrick, I thought the same thing (that VIMAGE had been turned on by default); thanks for the thread.

I guess "production ready" can mean a lot of different things, but to me, one thing it means is that I can use freebsd-update(8) to keep the thing patched. And as y'all know, if it's not in GENERIC, patching is no longer as simple as just freebsd-update(8).
To me, that press release reads that VIMAGE is already present.
It's present but not enabled by default. It's still considered experimental although I do believe FreeNAS uses it extensively for their jails.