My first glib reaction was something along the lines of

"Sigh, first they demoted Pluto, now they're adding new continents"

But in all honesty, I think this is cool (and humbling). We think we're just so smart some times. That our knowledge is so black and white and factual and additive. But it's squishier than that.

I'm reminded that

"As our circle of knowledge expands, so does the circumference of darkness surrounding it" (Albert Einstein)

We live in exciting times. Keep the discoveries coming!