How many copies have been sold so far? The Number it stands at is over 875,000 copies, before that we reported the milestones of 400k and 800k sold. Of course, it hasn't been easy, and they certainly aren't done yet. The developers actually acknowledge it within their latest blog update:

"We didn’t want to compromise on the brutal and unforgiving nature of the early days of the DayZ mod so we’re very surprised to see such interest as this clearly is not a game for everyone, especially considering that there are some radical changes under the hood in comparison to the mod. These changes may be more subtle than when comparing the relatively limited amount of content in the standalone game against the mod in its very mature state itself, but it should be much more valid in the long term for the overall game experience and of course we’re aware how much more work is ahead."

But what do they all have planned at this point forward on their road map? Well their list looks a little something like this at the moment:

Server performance, stability and security
Animals & hunting
Cooking & gathering resources
Playable user customizable vehicles
Player created constructions in the environment
More complex interactions with the environment and crafting options
Streamlined user actions and interface
Control and animations expanded and improved for fluidity
Upgraded graphics and physics engine (including ragdoll, etc.)
Support of user mods and more flexibility for user hosted servers and game types

'Support of user mods'? Modception(Ok technically not a mod anymore)? Either way, the sooner we have this the better, wouldn't it be amazing if another success story came out of a mod within DayZ?