Bonnie Ross, head of 343 Industries, has released a statement on the Halo Waypoint forums clarifying the development of Halo/Mega Bloks project Haggar and confirming its former development. She noted that Haggar was "just one example of several similar projects we have evaluated throughout the years".
Ross' statement reads as follows:
Over the past few days, footage has recently made the rounds of an exploratory Xbox 360 project we worked on several years ago, known as "Haggar." Since then, we've received a lot of great feedback from the community. Haggar was something we prototyped with our friends at Mega Bloks that focused on the elements of action, exploration and user creativity found within the Halo universe. Haggar had a lot of fun ideas and invention behind it, but ultimately didn't progress beyond the early prototyping levels that are shown in the recent video. This is just one example of several similar projects we have evaluated throughout the years — a process that we continue exploring on an ongoing basis."