X360A has received an unverified scoop from a Microsoft source regarding their achievement policy for Xbox Live Arcade games. Traditionally, XBLA titles have had a Gamerscore cap of 200, but this may be set to double to 400 according to the report. The maximum number of achievements per game would also increase from 20 to 30.
DLC packs may also receive a more generous achievement/gamerscore allowance. According to the report, the current total limit of 250 extra gamerscore is set to increase to 800, allowing developers to offer more arbitrary numerical rewards post-release.
If true, this new policy is set to come into effect from June 1st. Many gamers won't care one way or the other, but achievement hunters are bound to be excited by the news.