Well, I think everyone who's really studied the issues agrees that we're of one faith. But that doesn't mean reunion will be an easy thing. We have a slightly different way of looking at councils. Eastern Orthodox, from what I've seen (and I know very little, so don't think I'm speaking with great insight), tend to hold the oppinion that the 7 councils are exactly the way it had to be, and that was God's plan for laying out the faith, and to say something bad about one of the councils is practically blasphemy. In the OO Church on the other hand, we're not so hung up on councils. The councils did not create the faith, the faith did not change or progress from the time of the Apostles, and what's important to us is not that we recognize a certain set of councils, but that we hold that Apostolic faith. While the formulations of our doctrines came in a large part from the councils (which is important), the faith didn't, just the expression of the faith we have to day. What's really important is that we have the same faith, not that we explain it the same way.
So the Eastern Orthodox tend to say if we want unity, we OO have to accept the 4 councils we were not present for. We have a hard time calling councils eccumenical when we didn't even participate in them. They were also no big doctrinal issues covered there, eg one put down the iconoclast heresy, but that was never a problem for us to need a council to put it down, so why do we need it? Are point of view is lets not argue about political and lingual differences we had a long time ago, we have the same faith now, let's dialoge and work from there rather than trying to go back and change the past and make our histories at the councils all pretty.
Pope Shenouda offered to lift the anathamas with the EO's, since we are of one faith. Unforunatly the Greek Patriarch refused. It wasn't becasue we're heretics, it's because Mt. Athos broke Communion over lifting the anathamas with the Catholics, and Greeks are often raised to hate us much more, so they'd have his head if he tried to lift the anathamas with us at this point. I've met quite a few Greek Orthodox who are very strongly convinced that we're heretics, and until this residual hatred between us dies out, there's little hope for unity. I personally think that this hatred will be gone in a generation or two, and then we'll finally have the anathamas lifted.
Unfortunatly, even if the anathamas are lifted, it won't mean going to full Communion and being one automatically. At least one other issue that would have to be dealt with is divorce. The Eastern Orthodox Church allows divorce in a variety of circumstances that can somehow be construed as a form of spiritual adultury, such as abuse, substance abuse, etc, while we only allow divorce for actual adultury, as we believe Christ commanded. Also, Eastern Orthodox allows marriage to any Christian group, including Catholics and Protestants, while Oriental Orthodoxy only allows marriage within Orthodox, as we don't see it as making sense for one flesh to be both Orthodox and Protestant, or for the Holy Spirit to come down and make the two one when one of the two does not believe in Sacraments. If we were to go to full Communion then that would mean that we'd be completely unable to enfore these practices, since our people could go marry a Protestant in the EO Church, come back, and we'd have no choice but to give them Communion, so we cannot accept full unity becasue of these issues, so that we can preserve our practices.
As someone previously mentioned, there is some intercommunion between EO & OO, but this is not official. Since we recognize Eastern Orthodox as Orthodox, a properly disposed EO coming to Communion will probably be communicated, with silent approval from the bishops. However, this is hypocritical since there are anathamas between us, which is why I hope so much that the anathamas can be lifted. Once that happens this practice of allowing Communion in these cases will be ok, there'll be no problem with it. But it will still just be this limited Communion and not a full reunion until the issues of marrie and divorce can be overcome by the grace of God, either here, or in heaven, where there will be no schism or heresy, all will be orthodox and catholic, and no one will feel the need to protest.
