Coming from a country with an extended alphabet, I've always been aware of encoding issues, especially before almost everyone settled on using UTF. So the treatment in Python 3 (and equally in Go) is a game changer for me and many other language users out there. I'm not saying that, say, American developers don't need to support other alphabets, just that it's less pressing since they don't tend to deal with them on a daily basis.

So for this feature alone, I'm all in on Python 3.