The disc contains artwork, screenshots, and press releases for Resident Evil 4 and Resident Evil Outbreak File #2. There are also links to trailers on Capcom's website.
It looks similar to the E3 disc, Capcom E3 2004 Press CD. While the E3 disc was given out at the show in a small plastic case attached to a lanyard, this disc was probably sent to the gaming press after the show. It came in a small, clear plastic sleeve without a possibility to attach it to a lanyard. The discs' contents are probably the same, but this remains to be confirmed.