When will the Third Edition of the OED be published?
The Third Edition of the OED is already currently available in the form of quarterly updates of new and revised material. This revision project is unlikely to finish before 2018.
In the future it is likely that OED Online will be the version that most people consult. However, since the present hardback edition has many fans, a new OED in traditional book form is not out of the question. It will depend on demand and printing costs when it is finished.