It was announced earlier this week that Halo 3 prequel Halo Wars 3: Recon will be available to gamers next year and was described as a "new chapter" in the Halo saga.
However, Stephen McGill, Microsoft's entertainment and devices division head of gaming and entertainment, believes Halo Wars could be the game to watch.
He told MCV: "Any release in the Halo universe is sure to appeal to the millions of Halo fans around the globe.
"The original Halo revolutionised how first person shooters were played on a console and was the leading title in driving the success of that genre on the home console. We fully expect Halo Wars to do the same for real time strategy."
Halo Wars is to be released as an Xbox 360 exclusive some time next year and is a strategy based game focused on the Halo universe.