Halo 4 could introduce micro-transactions, it has been revealed.

Executive producer Dan Ayoub said it is currently "looking at" how Gears of War offers bonus cosmetic items for a small fee.

"I think Halo certainly has the potiental for those kinds of things," Ayoub told Digital Spy.

"We don't have too much to talk about in terms of our plans down that line, but it's certainly something... we've seen the fans of Gears are enjoying, and if it's something we think our community is going to enjoy, it's something we'll seriously talk about."

The release of the 'Castle' map pack this week completes the Halo 4 season pass, but Ayoub suggested that more content could be on the way.

Fan feedback will help decide the game's future, he said, but added that "anything we do will be pretty deliberate".

"Obviously our commitment is always that we're going to make sure there's something for people to do on Halo, whether it's playlists, or new maps or new content, something like that," he explained.

"We can't say too much about the specifics we're planning, but what we can say is we don't take that commitment lightly, and people should keep their eyes open for cool stuff."

Gallery: Images of Halo 4's Castle Map Pack:Halo 4: Castle Map PackBlack Ops 2 recently introduced micro-transactions for customisable weapon skins, reticule shapes and calling cards.

Halo 4 has been played by more than 11.6 million unique users since launching last year.

A May release was recently confirmed for live-action series Halo 4: Forward Unto Dawn on DVD and Blu-ray.

The 'Castle' map pack, which adds three new maps, Achievements and a multiplayer playlist, launches today (April 8).

> Read our full interview with 343 Industries and Certain Infinity for the 'Castle' map pack

> Halo 4 review: Master Chief's return is a captivating ride



Watch a trailer for the 'Castle Map Pack' below:

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