We generally don't notice, but normal speech is basically a broken mess for anyone, with ahs and uhms, and sentences that keep enveloping other sentences, and you never get back to the point you were making in the first place. It's a basic part of a journalist's job to filter the word soup that you end up with from a face-to-face interview - in an honest way, that truthfully reflects the points and opinions that were stated, of course. Usually, we have no problem understanding each others' jumbled verbal messes, when we're right there, and have context, tone, body language, etc., to make up for when the words are lacking - but those things obviously don't translate to written interviews.

In all likelihood, what Ken Levine "really" said was probably something along the lines of:

In the future, it will be - you know, what we really want to do, and now we have the technology, and because, BioShock really showed that there's an real desire among gamers for immersive experiences like this, so we're actually now fully able to to really realise that full, ahead-of-its-time vision we had with the original BioShock, it's about agency, player agency, that's really what it's about, you know, it's player driven - that's where we want to go. Because that's what makes our medium unique.

Or they replaced words. It's possible he said "It's" but since it's not currently true, they changed it to [will be] but I'm just speculating.