I'm just imagining the marketing meeting that lead to the development of this camera:
We need bigger numbers! Add more megapixels!
But consumers have worked out that more megapixels isn't necessarily better; we risk looking stupid if we just bump up the megapixels.
So what else can we increase? What's this ISO thing?
well, we could theoretically increase that, but it wouldn't make better pictures.
Can you make it more than 1 million?
Erm ... I guess so?
Then do it! MegaISO!!!!!