Wolfram launches new document format, meet CDF

I wonder what added value will this new format bring into the markup space, and cannot get it after snap look at the cdf website (http://www.wolfram.com/cdf)

Beside, I am currently downloading the player, and noticed that the player (for linux) is shipped as 220+ MB of bash file script. That is indeed the largest .sh file on my system.

My memory is probably a bit hazy but I thought that this was what HTML was supposed to do.

CD based "Multi-media" as well... but that was not markup I suppose.