It's not really hugely unexpected news, but I hope they're right. I'd love to replay it again with updated visuals (textures, lighting, etc). I'm guessing a 2014 launch (10 years from H2's launch)?
Though would it be a 720 title or still release for the 360 assuming the 720 would be out for over a year?
According to a close-to-development source, 343 Industries has indeed discussed a Halo 2 Anniversary, following the success of Halo: Combat Evolved Anniversary.
“It’s been talked about, however I’m not will to say anymore at this time,” said our source. This is the same source that told us last June that “unexplained laps in time” would be used to incorporate Halo Reach elements, which it indeed does.
Previously, in an interview with IGN, Microsoft Games Studios vice president Phil Spencer said that they’re not trying to run a remastering center, but “[they're] not putting [Halo 2 Anniversary] out of bounds.” Before that, he said that they only did the Anniversary Edition because it was the 10th Anniversary, and it “made sense.”
“There are obviously some great Xbox 1 games that would be nice to see, but we’ve focused most of our resources on creating new things. I’m not putting it in or out of bounds right now, though,” said Spencer.