Here's some info on the extended cut although Ridley's sort of vague:

Here’s the exact quotes from Scott on what will be on the Blu-ray and the deleted scenes:

SCOTT: This is fundamentally the director’s cut. But there will be half an hour of stuff on the menu because people are so into films—how they’re made, how they’re set up, and the rejections in it. That’s why it’s fascinating. So this will all go on to the menu.

You’re going to do an extended cut on the Blu-ray/DVD. Is it a lot longer?

SCOTT: Twenty minutes.

So there’s, like, twenty minutes that will be added back in for a longer version?

SCOTT: Maybe. But I’m so happy with this engine, the way it is right now. I think it’s fine. I think it works. It can go in a section where, if you really want to tap in, look at the menu. To see how things are long, and it’s too long. Dramatically, I’m about putting bums on seats. For me to separate my idea of commerce from art—I’d be a fool. You can’t do that. I wouldn’t be allowed to do the films I do. So I’m very user friendly as far as the studios are concerned. To a certain extent, I’m a businessman. I’m aware that’s what I have to do. It’s my job. To say, “Screw the audience.” You can’t do that. “Am I communicating?” is the question. Am I communicating? Because if I’m not, I need to address it.

But the pre-order for the blu-ray is already on amazon.com and there's no mention of a extended cut so who knows?