I think that they intentionally changed the logo to emphasize the C since so many people pronounced it incorrectly.

this is not new! our name has always been codecademy.

That's so funny - just like @joshdance said, I always read it as "Codeacademy". At least you have both URLs. I'd love to see a blog post one day that explains why you've chosen this name vs. that name. Co-decademy is a meaningless word to me (that's how I read it - "co" as in "codependence") whereas Code Academy makes 100% sense to developers.