I was puzzled by the image, the first time I saw the regular XKCD page -- I didn't see the point. So I looked at Explain XKCD, and found out it that the image was being updated periodically. I checked in again later, and saw that it was basically an animated movie, which is easily missed if you look at just one static image. The thing is, there's no point to watching an animation going up, one frame at a time, over months. You're not going to get any special insights that way that you can't get when it's completed, by watching the whole thing. You could presumably go back over individual frames at that point if you want to do a close analysis of it. But there's not enough to go on yet to make sense of it.
From what I've seen of this series so far, I'm guessing it will turn out to have some meaning that can be fully explained in a sentence or two.
There's a trend in entertainment of measuring out some serial narrative, one tiny fragment at a time, and encouraging the development of a fanbase that will analyze each succeeding fragment. This happens with Webcomics, and augmented reality games, as well as with series of computer games, series of novels, and television series. While there's no shortage of bunk that appears in the fanbase's theorizing, you'll inevitably see theories emerge that are far more interesting than what the writer originally had in mind. Inevitably, the fanbase will end up burned out and disappointed.
At some point, people need to learn to develop the self-respect to just stop hitting refresh to find out what the answer is to the enigma. Just check in again in a few months, when it's all over. It'll probably seem quite clever or interesting for the minute or two it takes to watch the whole thing.