The new airports management was initially given to TAV, a consortium that manages Istanbul Ataturk International. (The consortium consists of two Turkish companies and Vienna airport consulting.)
The hardliner Islamists tried to prevent the airport to be operated by a foreign company (they claimed that TAV has ties to Israel) and two days it became operational the Iranian army moved into the airport. (This is what was told in the Turkish press)
apparently some internal struggle is going on between moderates and hardliners, because the Iranian president himself promised to the Turkish PM
recently that the airport will be opened under TAV's management, as soon as some issues are taken care of.
As far as the airport goes, the images I saw showed a modern airport, and TAV s contact includes a second terminal to double the capacity.