Certainly not their first major recall -- I remember my iBook's battery being recalled as part of that exploding battery debacle. There was something with poor soldering of motherboard components, too, that affected the generation of iBooks previous to mine.
I wonder if Apple could keep costs down here by shipping those rubber bumper cases to everyone. Unless this is some bizarre feedback issue that can be fixed in software, I don't see how Apple could recall the iPhone 4 and truly fix this short of a major redesign. And I'd hate to see that happen, if for no other reason than it would seem such a waste...
Do they? I've seen more people saying they expect it's just a software/presentation problem. Not that I think there's any particular reason to expect either group to know what they're talking about.
I worry about the conditions apparently needed to reproduce this (and the fact that I still can't reproduce it). Even Ars' explanation includes "consciously" holding the phone in a different way than you naturally would and licking your hands before doing so...