First, let's deal with the it's not true. Even if it is a virus, a worm, a trojan or simple malware, it is not the first. That was some time back. I'm sure various sites can confirm the name, where it was found and what it did, but it existed, so that this is the first of its kind is not true.
The second part of the it's not true is debatable and more complex. Whether you want to call it a virus, a worm a trojan or simply malware depends on the definition of those terms and who you talk to. That's really not important though. What most of us who use computers fear is malware that runs without us knowing, infecting not only our computer, but any other computer with which it comes into contact (electronically speaking). This "Leap-A" does not do this. In fact, it takes an awful lot of user interaction to make it work. In addition, it does so only under very specific conditions. So, it is not as disastrous as it sounds. This is the true difference between Windows malware and Macintosh malware. In Windows, you have to fear the unknown, just being online can bring your machine down, can infect everyone you know. With OS X, that's simply not true. It takes user intervention to infect machines.
Does this mean that it's not harmful or that we should forget out it? Certainly not. What it does highlight is two very major issues in the computer world today.
First, user have to be mindful of what they are doing. If something comes over email or through other electronic forms of communication, even if it's originating from a friend or associate, do not automatically trust it. If you're not expecting it, or it seems odd to be coming from that person, don't trust it at all. I know this can be a hassle, but keeping your computer safe is not as easy as it once was. Careful online computing will save you from most Windows malware and Macintosh malware.
Second, in this day and age of instant information, news sources compete at being the first to report on stories to a level that never existed before. Information is great, as long as it's accurate. However, due to this competition, it's often misleading at best and wrong at its worst. This whole OS X virus thing is a perfect example of that. Once the story broke, every major news outlet ran with it. After all, a virus for OS X is big news in the computer world. Windows only sites were claiming they were right all along. Malware on OS X would come once it became more popular. Proving in their eyes that OS X is no more secure than Windows. Popular news sources gave quotes from major security based companies. Doom and gloom for Mac users. Yet, days later we see that it's not all that.
What is obvious to me is that this piece of malware is no more a virus than the trash icon, no more a worm than an email client. If you don't know what you're doing, you can delete a file in the trash. If you aren't careful, you can send a message out to your entire email list unintentionally. But either of these takes user invention and stupidity or ignorance. Just as is the case with "Leap-A". But because of immediacy needs for news sources, I will have to spend months listening to people who claim to know that there is finally a virus, or a worm, for OS X. This would be bad enough if it were true, but it's worse because they want it to be true and I am simply a Mac fanatic.
So, what did this all teach us? That news sources, especially major companies like CBS and Reuters should be more responsible with their reporting. That just because it says so somewhere online, it's most definitely not absolutely true. That quotes from companies that profit from misleading statements should not be used freely (I absolutely do not want to imply that these companies gave the quotes to mislead the public, but that the stories themselves do benefit them).
What did it not prove or disprove? That OS X is impervious to assault from malware. This incident in no way shows that. Despite its strengths, OS X was developed by humans and is a complex piece of software. There are obviously going to be faults somewhere within its code (as is made obvious by the routine updates through Apple). However, at the same time, one of its strengths is that even if someone finds those faults, OS X does its best to limit the damage it can do. There are limits to that though. The users are also human and intervention by those users to allow bad things to happen is always possible. However, don't mistake a user caused problem with a piece of malicious code that does its dirty work behind the scenes without knowledge or help from the user. No one can build an OS that protects completely from the first, so, I use OS X to be the best to help in protecting against the second.
