Digital Foundry uploaded a video showing Alan Wake on X1 BC.
Improved frame rate and no screen tear are great improvments. However, the game is apparently too dark in some scenes, he even says the game is probably best played on 360.
I've found myself raising the brightness in the options of dark games (such Gears of War). Not sure if DF attempted that, Alan Wake does have brightness settings.
Edit: After playing through the first episode, I can confirm simply adjusting the brightness makes the game easier to play in dark areas.
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