My guess is that the majority of OCICBW...'s readers would take the attitude that this is a personal matter for each individual gay bishop to decide and they would have great sympathy for the position these bishops find themselves in. I suggest that although the sympathy is completely warranted the allowance of secrecy is completely wrong.
The bishops in this position were gay before they accepted their promotion and would have been fully aware of the current attitude of the rest of the church hierarchy towards their sexuality. If the church was still in "don't ask, don't tell" mode then not mentioning their sexual identity would be up to the individual bishop to decide and, as we are talking here about "don't ask, don't tell," I would understand if they decided not to tell. But the church is no longer in this mode. The church is discussing and voting on whether or not gay people can be bishops.
The General Synod is the Church of England's government. In English secular government, members of parliament have to declare any substantial personal interests they have in any debate and vote (this does not disqualify them from voting on or debating the legislation). I believe that this same rule should apply to the closeted bishops who are voting, at various levels of church governance, on this matter. The reason they should do this is because their openness, or alternatively their continued secrecy, has an effect on the voting of others. Not only would their disclosure of their sexuality show the reality of the situation, which in itself could very well influence the way any votes go, it would also render it unnecessary for straight colleagues to vote contrary to their own beliefs.
So, what about the outing of gay bishops? Again I am going to be controversial in my answer. If a journalist discovered that a member of parliament was hiding a personal interest in a matter under parliamentary debate and published what they had discovered, the journalist would be applauded for her action, not condemned. I can see no reason why this should not apply in church politics. If somebody has conclusive proof that a bishop is gay and not declaring the fact when debating matters of human sexuality within the "parliaments" of the church, then it is that person's duty to the church community to bring this fact to public attention.