Photos of the DC Direct display can be seen at
http://afigures.com/g/?mode=album&album=2004_SDCC%2FDC_Direct.
There are a few Superman figures (one "battle damaged", and is that a Bizarro with the reversed S?), and a Teen Titans Superboy.
There's also a very nice Crisis on infinite Earths Supergirl figure. This should be released in June 2005.