I mean, it's not certain, but at this point it's probable.
Why do I say that?
And who am I talking about?
If you don't recognize his picture, it's John Henry Cardinal Newman.
As to why is it probable, well, he is to be beatified.
If he is beatified, it is likely that he will (at some point) be declared a saint.
(NOTE: There is already an investigation underway of a possible second miracle needed for sainthood.)
If that happens, it's a dead certain lock that he will be named a doctor of the Church.
Because Newman's writings made the kind of important theological contribution to Catholic teaching that doctors of the Church make.
In particular, his theory on the development of doctrine helped the Church in a very important way by allowing theologians to better articulate the manner in which doctrine progresses, how something can be implicit in one age and made more explicit and precise with the course of time. He also did important work on the doctrine of conscience and other subjects.
Newman's theological contributions are so substantial that if you look at the index of people cited in the Catechism of the Catholic Church and if you eliminate all the saints and popes, you're left with basically three names: Newman, Origen, and Tertullian.
At least those three get mentioned more than anybody else in the not-a-saint, not-a-pope category.
Tertullian will never be a saint, because he died a schismatic.
Origen is undergoing something of a rehabilitation, as can be seen from the kind of treatment B16 gave him in his series of Wednesday audiences on early Christian figures.
But Newman is the closest to being given the title "doctor."
It may even happen at the same time as his canonization, should that be forthcoming.
MORE ON NEWMAN.