The only thing that differentiated a Superbit DVD from the regular DVD edition is that the Superbit copy would have a DTS soundtrack (half bit-rate 754 kb/s) and no bonus features. Sony otherwise used the same video masters on both editions, and the marketing hoopla about maximizing video bit...
Yes, the line was called Superbit. The Panic Room DVD was a Superbit disc, though the case art only referenced this on the back cover.
Most Superbit titles splayed this info on the front cover where you couldn't miss it.