Originally Posted by
fex
Unfortunately, this is correct. The text is rendered to a flat image, then that image is simply scaled up on critical strikes or at higher resolutions, which is why you don't get crisp images.
Now, I could be mistaken, but I think I remember someone on that other wow leaks forum (you know the one...) saying that in a recent beta patch, all of the default combat text was being converted from scaled rendered bitmaps to true vector text. Of course, since that forum has since been taken offline (*cough*), I can't really go back and find out for sure.