Sounds good to me so far. What do you think?"Jay has said, and I don't have exact quotes so I'm going to put it into my own words, that full immunities aren't something we're looking to have in Diablo III right now.
He added though that as we plan for people to have a good amount of active abilities at their disposal, there may not be the issue of having say... a Wizard with only ice damage spells late in the game where immunities would normally be seen.
So if we were to have immunities, but also a broad range of abilities with various damage types ensured to be available, it would be more a situation of the player just needing to intelligently use the different spells they have. At that point it becomes a method of injecting strategy into approaching a fight. The spell variety and build potentials, or rather limitations in this case, remain to be seen to some degree.
I think if we can determine that players will always be able to damage a monster regardless of immunities, then they remain a possibility. More than likely though, if I had to guess at this point, you'll see resistances to specific spell types rather than full immunity."