We just got some more information in regards to the netcode of the upcoming Steam release of KOF 98 UM Final Edition. According to the Code Mystic, the netcode will not be a rollback style netcode, but rather an input-delay type, with delays equal to 1/2 of ping. Ping numbers will be displayed before matches. The reasons for this decision was due to the fact that the XBLA/NESICA source code was not built for rollback.

@DesDelaghetto @Jack04311910 input delay, equal to 1/2 of ping. You’ll see ping before match. XBLA/NESiCA source wasn’t built for rollback. — Code Mystics Inc. (@CodeMystics) November 27, 2014