It might not be an issue for you, but some users who have purchased new iPads have found that the magnets of their existing cases won’t turn the display on and off. This doesn’t just go for third-parties, either: even some old Smart Covers won’t turn the screen off.
What the heck’s going on? As it turns out, there’s a small change in the way the new iPad that only applies to magnetic cases: polarity now counts.