Following Metal Slug 3, the next SNK Playmore classic coming to PlayStation 4 and PS Vita via Code Mystics is The Last Blade 2, the company announced during the PlayStation Experience 2015 opening keynote.
The Last Blade 2 first launched for arcades in Japan in November 1998. It was released for Neo Geo in January 1999. It is a fighting game featuring 21 playable characters. Read more at the SNK Wikia.
A release window was not announced.