According to a letter obtained by the web site The Diocese Report, a Vatican official at the Congregation for Institutes of Consecrated Life and Societies of Apostolic Life has said that an openly gay man may be admitted to the seminary for a Dominican community since he has pledged to remain celibate. I don’t know how authoritative an undersecretary’s letter to a someone writing to complain is, but I think it carries some weight.
I think two issues are addressed in the letter. First, that the seminarian has been clearly told the Church’s expectations for celibate chastity and that the local superior assures the Vatican that formators will keep a close eye on him. Whether either of those will actually happen is another thing, but if the best case scenario were to be borne out, then they see no reason for him to be excluded.