The decision that women could become bishops when the appropriate legislation was enacted was taken some time ago but since then there has been a lot of concern about how those people in the Church of England who either don't accept the ordained ministry of women, or don't accept that women can be bishops, will be enabled to remain as part of the C of E and this has held things up considerably.
The last vote resulted in the proposals which were then on the table being rejected. new proposals are being brought back and voted on tomorrow. If the Synod doesn't vote these through then it will be back to the drawing board once again.
A lot of people have been involved in finding a way forward on this, so prayers would be appreciated for the meeting and the vote tomorrow.
For what it's worth, I personally think that the proposals currently on the table are more workable, and fairer to everyone, than the proposals that were voted down. Obviously I am in support of women being bishops - but I have heard that at least some of the people who don't think women can be bishops are happier with the way ahead now proposed than they have been with previous proposals.
For more background, there is a detailed document of the history of the currrent vote on the Church of England website here
Live streaming of the debate can be seen at http://www.churchofengland.org/media-centre
The prayer for the General Synod is
you have given your
Holy Spirit to the Church
to lead us into all truth:
bless with the Spirit’s grace and presence
the members of the General Synod;
keep them steadfast in faith and united in love,
that they may manifest your glory
and prepare the way of your kingdom;
through Jesus Christ your Son our Lord,
who is alive and reigns with you,
in the unity of the Holy Spirit,
one God, now and for ever.