It seems that deusveritasest is talking about ultimate reconciliation; while people will go to Hell, it is in Hell that they will work out their salvation. Such a view, in my opinion, is not heretical as it still requires the person to make a decision and to endure a process.
At the same time, such a view is problematic. For one, it assumes that people in Hell suddenly "get it" or will eventually "get it." But look at the rich man in the parable Jesus told us. The very first thing he was concerned about was himself. He wasn't apologetic, he wasn't contrite, he wanted water and he wanted that poor slob Lazarus to bring it to him. Then he wanted all of Heaven to bow down to his wishes and have Lazarus once again serve his desires by going to preach to the rich man's family.
What else is interesting in that passage is that Jesus mentions a great chasm between Heaven and Hell, one that cannot be crossed.
It would seem that Scripture does teach two things:
1) Those who are in Hell remain defiant
2) At the Great Judgment, even then some will remain defiant.
Will some people pass from Hell to Heaven at the Great Judgment, having served their time and learned? I don't know. Will we burn in Hell for eternity without Christ, even if we recognize our mistake? I don't know. The Scriptures say quite a bit about Hell without saying much; I think that is by design.
As for Rob Bell's beliefs proper, let me give you a fair warning about this from someone who is currently involved in this aspect of Protestantism (not as an emergent, but friends with quite a few):
I am a friend with the person who has been working with Bell for a few years now. He's spoken at his church a few times. What my friend believes and what many Emergents (especially the leadership) are starting to believe is that salvation is for every human...because there is no afterlife. For some it's an outright denial of an afterlife, for others it's extreme skepticism with them concluding that it ultimately doesn't matter.
For my friend in particular, in public he won't deny the resurrection, but instead skirts around it (after all, he'd out himself and wouldn't sell as many books), but in private he denies the resurrection of us, of Jesus, and denies what he calls the "metaphysical God." In other words, God only exists in your actions. This same friend has been a major influence on Bell the last few years.
Now, I don't think Bell will go this far in his book (my friend hasn't told me), but do keep in mind that this is the direction it's all heading (maybe not for Bell...yet). It's heading to a denial of our resurrection along with an afterlife at all; you die and that's it.