The company and the game are not done, if you look at the last paragraph it says that they've started a new developing company called Fractiv, they're simply in the process of looking for a new publisher. Believe it or not this is pretty common within the industry, companies lose interest or have some irreconcilable differences with the developer so they sever their ties. With a game this promising it's only a matter of time before some other publisher picks this up.
Sam McGrath goes on to say:
"Unfortunately I can't say any more than that at this stage but I'm looking forward to answering your questions in the near future."
If you read between the lines, this means that he's in talks with a new publisher, but since the deal's not hammered down, he cannot disclose any details at this time, but the inference there is that he will reveal a new partnership with a different publisher within the next few months. His statement about looking forward to answering questions soon is indicative of that.
Oh and be sure to check out the other gameplay videos on youtube, the one shown in this article is only the tip of the iceberg, look for the one with the crossbow and the giant city falling down, the game looks astonishing.
Edit: Typo, changed "one" to "done" in first sentence.