Is there any official release date for the Arduino Zero?

Price of making a card has 3 main posts:

  1. the number of components to be mounted
  2. PCB area
  3. development costs

Price of a micro-controller:

  1. development cost
  2. cost of housing
  3. Once the manufacturing is stabilized, cost of the die depends only on the surface of the die.

Board sale price is the maximum price that buyers are willing to pay for the product.