It's ovbious that apple knew about the problem. Maybe too late into the production (most likely, however I wonder why an engineer didn't point out the possible problem sooner) of Steve was too stubborn to change anything and threw a tantrum (not likely)
They were then stuck with a phone they knew was having signal
issues if you hold your phone like a human at all, either redesign the phon, which could of potentially been up in the millions of pounds to do, ovbiously depending on how far along they were; or they could bring out their first ever 'case' for seemingly no reason and then push it as much a they could at the conference.
This will ovbiously be incorrect if the problem is FIXED with a software update, and I mean fixed, not hidden.