Well, we didn't get to see Alan at GDC, but Remedy did show up, and Oskari Hakkinen, one of the lead devs, gave an interview. Glitchspot won't let me post the link for some reason so hereare the juicy bits:

"- So how long is an episode?

- It Unfortunately I can not talk about yet, but I can tell you that each episode is unique and has different content. Grunnmekanikkane is always the same, and the controls are like, but the atmosphere and can be viewed no different from episode to episode. You travel to different areas, such as Bright Falls in Washington, and elsewhere. Alan Wake is trying to find the pages of his manuscript.

-His manuscript? How he lost the pages?

Yes .... it is a mystery right now.

- I understand that you can not tell when the game comes in the sale, but can you tell us when we will see more of the game?

-Very soon I hope, but I can not tell you precisely nothing. "

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Hmm...soon...