The Halo 4 developer is reportedly working on a "secret project", according to OXM (via CVG).
"Following the success of [the] remake [of] Halo Anniversary, 343 Industries has now started development of Halo 2: Anniversary," the magazine claims.
The original Halo 2 released for the Xbox in November 2004. Any remake would almost certainly appear in 2014 to mark the ten-year anniversary.
Last year's Halo: Combat Evolved Anniversary contained HD visuals, as well as a co-operative campaign and online multiplayer.
It also introduced a classic mode, allowing players to switch back to the original visuals at any time, as well as story teasers for Halo 4, which is released later this year.
Halo 4 was named 'Best Shooter' and 'Best Multiplayer' during Digital Spy's Best of E3 2012 awards.
> Read Digital Spy's review of Halo: Combat Evolved Anniversary
> Retro Corner: 'Halo 2'
Watch a trailer for last year's Halo: Combat Evolved Anniversary below: