It's something that I personally disregard. According to the bible, predestination -at least as far as Calvinists describe it- is impossible. Also "Open Theism" as some people describe it is also impossible. In sorting through it, the only conclusion that can be reliably drawn from it is that God has a plan for humanity, that plan includes a group who will be saved, and that plan will be completed. Everything else is speculation. We know what we are required to do and we should do it. And we should do it without a lot of theological speculation that only divides.
But if it helps, one Orthodox view of predestination is found in the Confession of Dositheus, written by a Synod in Jerusalem in 1672:
We believe the most good God to have from eternity predestinated unto glory those whom He has chosen, and to have consigned unto condemnation those whom He has rejected; but not so that He would justify the one, and consign and condemn the other without cause. For that would be contrary to the nature of God, who is the common Father of all, and no respecter of persons, and would have all men to be saved, and to come to the knowledge of the truth. But since He foreknew the one would make a right use of their free-will, and the other a wrong, He predestinated the one, or condemned the other. And we understand the use of free-will thus, that the Divine and illuminating grace, and which we call preventing grace, being, as a light to those in darkness, by the Divine goodness imparted to all, to those that are willing to obey this — for it is of use only to the willing, not to the unwilling — and co-operate with it, in what it requires as necessary to salvation, there is consequently granted particular grace. This grace co-operates with us, and enables us, and makes us to persevere in the love of God, that is to say, in performing those good things that God would have us to do, and which His preventing grace admonishes us that we should do, justifies us, and makes us predestinated. But those who will not obey, and co-operate with grace; and, therefore, will not observe those things that God would have us perform, and that abuse in the service of Satan the free-will, which they have received of God to perform voluntarily what is good, are consigned to eternal condemnation.