If max 2.000 people at GNOME cannot find any bugs anymore, that does not mean it'll be stable when used by a huge distribution. 1000x the users = discovery of way more bugs. So September 2013 something initial, April 2014 I expect a distribution like Fedora to help out with testing, but conservative distributions probably wait a bit longer (openSUSE, Debian).
No announcement yet.
GNOME Will Move Full-Speed With Wayland Support