In the UK, GameCube outsold....

[A Black Falcon]

http://www.gameforms.com/news/?732

Metroid Prime to receive enhancements for PAL release
» Hey Retro/Nintendo - try finishing the next one for the market supporting the series.
It looks like being the last place to get a game is quickly becoming the best option. On top of bonus packages from such companies as Konami, PAL gamers will now receive a powered-up version of Metroid Prime. Nintendo's instant classic will see a number of tweaks to increase difficulty, but more notably, a good bit of speech will be added to the game.

Enemies will take more shots to kill, deal more damage, and drop fewer health and ammo refills when finally killed. Environmental hazards will also do more damage. The environment will now include doors that require multiple shots to open, a touch from previous Metroid games. The optional hint system will also take longer to kick in. No word on how these changes affect any Hard Mode remaining in the game.

Other improvements include the ability to skip cutscenes on repeat trips through the game. Voice acting, which made a brief and tinny debut in Super Metroid, will be added in multiple ways. Voices will announce locked doors, read scan data and new entries in Samus' log book, and appear in the game's opening and ending sequences

As I said... really cool stuff -- voice acting, the game is harder (enemies take longer to kill, drop less powerups, and hurt you more), some doors that take multiple shots to open, less frequent hints from the hint system, you can skip cutscenes...