More units in sc2?

okay in all the sc2 videos I have seen it seems that there are more units in gameplay now then there ever were in sc1 is this due to increase in building capacity new kind of supply cap thing or is it due to an increase in minerals or something. Just curious i mean most likely its done in a way to show what they look like and not to show how actual game play works.

 

No its because blizzard teams are good players, and good forces has wide unit spread.

 

And also, most of the "gamepaly" shown is staged, to show off individual units or mechanics.

There is a video of a game played by professionals that involves much smaller numbers of units.

Take a look at this: http://www.gametrailers.com/player/usermovies/187369.html

 

I think the amount of units will be pretty much the same as in the original SC.