Halo 4 in development for two years

Anniversary extras star Guilty Spark.

Microsoft's 343 Industries has been working on Halo 4 for two years.

In a panel discussion at Comic-Con reported by GameSpot, Halo franchise boss Frank O'Connor said it was a relief to announce the 2012 Xbox 360 exclusive at E3 last month because the team has been working on it in "relative secrecy for a couple of years".

Halo's Covenant-beating hero will appear "changed" in Halo 4. And there's a story behind his new look – yet to be revealed.

Source: EuroGamer