DayZ’s December launch is in doubt.

Speaking with Joystiq, creator Dean Hall was unsure if the game would make its release window.

"We really don't know, it's still our target," he said last week.

"The changes we've been making are so fundamental to the game that estimates can be a bit of a stab in the dark. The lucky thing is, so far nearly everything has taken less – even much less – time than we expected.

“So there could be a massive amount of unforeseen work that comes out, we just don't know until it's done and we test."

Regardless of whether the game surfaced or not, there would be open capacity testing this year anyway, so those eager for a glimpse of the open world survival horror title wouldn’t go wanting.

During its development, Hall had wanted to share more of the project, but was wary of copycats.

"I wanted to release some more media, UI concept work, and a whole host of stuff. But it is really heartbreaking to see my ideas get plundered, so unfortunately that has had to be shelved for the moment.

“I've been pulling 16 to 20 hour days on DayZ since March without a break and often including weekends, so it's like having someone kick you in the kidneys.

“But I hope to have some of this stuff out as soon as we know a fixed date, and that way there is no way our ideas could be replicated before then."

Hall said he would prefer to miss the release date and release a better product later on.

“If it comes down to it, we will slip the date no matter what effect it would have on sales, rather than ship something we believe is not ready as a first step.

“We're also trying to be honest about the uncertainty over the impact of these major architectural changes. Initially, this was just going to be 'mod on steroid'. This is now really a refurbishment of the engine specifically to suit DayZ."

He maintained that DayZ would have to be a “commercial success by a high factor" on PC for a console version to be considered.

"I personally think that, assuming we don't majorly screw up, once the PC development has stabilised and sales have been good, a console port would be very likely.

“So, do I think a console port will happen? Yes. But not until the PC is done. And by 'done' I mean finished its creative process."

In July, Hall said he expected a standalone version of DayZ to be out by the end of the year.