The MP Myth is actually a bit of a myth in of itself.
Yes, a lot goes into making a good camera and the lens is often way over looked. Yes, many camera have too many megapixels resulting in poorer low light performance. Yes, you do want a larger sensor to increase the megapixel amount, versus increasing the density.
However, new backlit sensors have really compensated a lot for the low light performance of the increased pixel density. And in situations where improvements to the lens can't necessarily be made, improving the pixel density can offer other advantages, such as actual usable digital zoom and image stabilization along with other sensor processing that can make up for the limitations of the negative impacts of increasing the pixel density.
The bottom line is that it's a much more complex formula for evaluating the impact of one level of megapixels versus another. More pixels could make things better, worse, or indifferent.
Considering this company's history, as well as Apple's, it's likely this sensor is going to deliver better images while using less power and occupying less space. So what's not to love?