From what we could tell, nearly all these titles had received "enhanced" graphical upgrades. Super Contra, for instance, featured some flashy shimmering swirl effects when enemies were pelted with bullets. Even the original Contra had been given a facelift. Others included Gyruss, Track and Field, and Rush n' Attack. We're assuming there are options to choose between enhanced and original visuals, as was the case with Frogger when it went live. Though some may balk at modifying what they consider classic presentation, it's still a welcome option.
We also saw a number of these games supported Xbox Live. Not just leaderboards, but actual play. After booting up Super Contra, we were able to actually set up a server and wait for someone to join in for cooperative play. We'd love to bring you more details about what was included in each of the games' menus, but we can't read Japanese.
At SNK's booth we picked up a pamphlet listing Metal Slug as destined for the XBLA. No release date was printed and it wasn't anywhere to be seen, but it's still good news for action fans.