From PlayStation Blog US.

http://blog.us.playstation.com/2009/10/uncharted-eye-of-indra-–-first-episode-on-psn-today/

UNCHARTED: Eye of Indra – First Episode on PSN Today

Posted by Neil Druckmann // Lead Game Designer, Naughty Dog

I hope everyone’s digging UNCHARTED 2: Among Thieves. It’s awesome that so many of you are already playing through the single player campaign for the second time, or even multiple times. For all of you wanting more Nathan Drake, you’re in luck – hitting the PSN today is UNCHARTED: Eye of Indra – a four episode Motion Comic – it’s an original prequel story to UNCHARTED: Drake’s Fortune. We’ve been working on this baby for the past year and it’s been brutal not being able to talk about it.

For those unfamiliar with them, a Motion Comic is essentially an animated comic book – you watch it like a movie. Characters move, there’s some 3D effects, and cool panel transitions. Expect some of your favorite characters and voice-actors from the UNCHARTED universe to show up throughout the story. Other than Nolan North reprising his role as Nathan Drake, I can’t announce who else shows up in the story as that’ll spoil some of the fun.

We’re launching the first episode for free to whet your appetite and the rest of the episodes will come out in November. Be on the lookout for an upcoming announcement about an awesome pack-in that we’ll include with future episodes.

Alright, enough out of me, go download the first episode and see what Drake was up to a few months before he used Elena to raise the coffin of Sir Francis Drake.

Nice.
How long is it? Like 20 minutes?

I would say it's pretty long, since Neil is saying they've been working on it for a year.

No but I meant how long per episode?

I think it will be something like 20 minutes per episode.

when does the American Store update? like how many hours from now lol im in the UK you see

awesome. I'm on my 3rd playthrough already it gets better each time. first was on hard second was on very easy to get the weapon kills 3rd is on crushing and 4th will be for all the treasures if i miss some.