Along with that rather unwelcome news, the studio also revealed its development plan going forward into 2015.
The price point shift "is part of a gradual price change as we progress with the development and reach the goals that we along with your help set for the project", according to Bohemia. They're increasing it in stages, rather than bumping it all the way up when the game leaves Early Access.
You'll be able to grab Day Z for the current price during the Steam Exploration Sale, which lasts until December 2. When the game's ready to release in early 2016 the price will cap out at 39.99 EUR / $49.99.
As for those planned additions, here's Bohemia's current schedule:
Q1 2015 Basic vehicles Central economy (advanced loot distribution) New renderer New Zombie AI Basic stealth system (zombies, animals, ...) Diseases Q2 2015 Advanced vehicles (repair, modifications, ...) Advanced animals - life cycle, group behavior Player statistics New UI Stamina / fatigue Dynamic events Q3 2015 Traps Barricading Character life span + soft skills Animal predators + birds Aerial transport Console prototype Q4 2015 BETA version Animal companions (dog, horse) Steam community integration (Achievements, Steamworks modding, etc) Construction (building shelters / walls / ...)