Japanese developers Noise Factory and Mega Enterprises have announced plans for a fourth installment in the 2D shooter series "Metal Slug." From what we"ve been told, the game will begin testing in Japanese arcades later this week. Specifics regarding associated arcade architecture and gameplay remain undisclosed. For reference, the Metal Slug series has remained a staple in the software catalog of SNK"s Neo Geo console. Expect more details and media in the coming days.