Spotted by VG247, Kaplan's portfolio notes that he handled "the production of character development and in game assets for the vertical slice of a first person shooter based in feudal Japan."
A vertical slice is a term used by developers to reference a brief chunk of gameplay that showcases many of the game's primary features - they are often used by developers when pitching potential games to publishers.
Kaplan's brief contract and the mention of a 'pitch' on his LinkedIn profile suggest the project never made it past the conceptual stages.
Square Enix's last big shooter was 2006's Final Fantasy VII: Dirge of Cerberus. VideoGamer.com said you'd be best giving it a miss "unless your idea of great gameplay is random button hammering broken up by really badly-acted cut-scenes" in a 4/10 Dirge of Cerberus review.
Maybe it's for the best that the project was cancelled, then.
Kaplan is now working at 343 Industries. Does he know about the next Halo game?