The new subtitles will feature the same font and size, but outline makes shadow more darker and black is the color alone to make the "more realistic" and "more darker" shadow. The color black is the outline color.
Here is a video for you to have a look to it. The new subtitles will debut in AGK series and intro, Hitler Parodies and mainly, all Sony Vegas Pro 11 made videos. Subtitles are recommended for people who didn't listen what everybody talks, and are meant to be put.