I don't know how many tens of millions of iPhone 4s were sold. It amazes me that some don't believe at least one of those sold could have a battery defect which would result in a fire.
While there are many frivolous lawsuits. State Farm is one of the claimants. I find it hard to believe they would get involved. Unless they did some investigation and decided there is some basis to get involved. Rather than just pay out the claim and move on.
Let them have their time in court. I'm sure Apple will want to test it. If they are responsible. I do wonder if they will settle or fight it out.
There are groups, especially in medical malpractice cases, that track what Companies (Insurance Companies, too) will settle for as a deminimus nuisance payment. The it's-cheaper-to-pay-than-defend. I don't think State Farm realises the non-dollar impacts to Apple giving "go away" money. Every news outlet would report "Apple pays State Farm over home fire..."