Here's a thought: the rumor of that "Halo Blue" SKU is that it ships in September. Assume for a second that it's a Halo 3 SKU with the multiplayer maps bundled in (ala the Gears of War re-release) at a budget price.
When the Halo 2 Map Pack shipped to retail, the download maps were released on the same day, July 5th. It could be possible that 1) September is when the next Map Pack somes out (the first two have been announced about a month in advance, and we're only two months out from the end of September), and 2) the next map pack will be the last one. Otherwise, the SKU would have an incomplete set of maps included.
I realize I'm heaping speculation upon speculation, but I thought it was worth tossing out.
When the Halo 2 Map Pack shipped to retail, the download maps were released on the same day, July 5th. It could be possible that 1) September is when the next Map Pack somes out (the first two have been announced about a month in advance, and we're only two months out from the end of September), and 2) the next map pack will be the last one. Otherwise, the SKU would have an incomplete set of maps included.
I realize I'm heaping speculation upon speculation, but I thought it was worth tossing out.