I can only share my own perspective/opinion as a Catholic, and I think that (if there is a hell) it isn't a place of punishment, but rather it is a state of existence outside the direct presence of god.
I guess that the best way to explain hell is to first define heaven. I see heaven as open to anyone/everyone regardless of their belief or their non-belief. In other words, it is a gift to all who live their lives in the service of others, especially those most in need. And (conversely) those who ignore those most in need during their life will not experience the direct presence of god after their death. But I also believe that hell does not have to be a permanent state of existence - and even someone in hell can eventually experience the direct presence of god in heaven.
So it's not so much that hell itself changes (and people are or are not paroled based on the current teaching of the church) but rather our perception of hell changes.
Again, these are just my personal thoughts - as always, I appreciate the opportunity to discuss topics such as this.
Thank you again - wishing you well and peace 
Tim
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