Earlier today Nintendo announced that the Wii Virtual Console would support Neo-Geo and MSX games in future releases. There is no such announcement for the release of MSX or Neo-Geo games in Virtual Consoles of any other regions, but it may only be a matter of time at this point.
SNK's Neo-Geo is a very expensive cult-favorite system, with specs almost identical to SNK arcade machines; the Neo-Geo was probably most notable for featuring iterations of SNK's chief franchises such as King of Fighters, Metal Slug, and Samurai Spirits. The MSX was a personalized home computer borne from Microsoft's Japanese branch that had four different versions between 1983 and 1992; the MSX had a great deal of early successes but soon fell behind Nintendo and Sega's early systems in the 1980s. However, its legacy is significant, as several storied series such as Metal Gear, Dragon Quest, and Bomberman all had their debuts on MSX technology.
In related news, earlier today the European Virtual Console received the iconic N64 game The Legend of Zelda: Ocarina of Time. It's probable that Ocarina of Time will become part of the North American Virtual Console when it undergoes its scheduled update on Monday.
Source:
Japan's Virtual Console website