Digital Cinema deployment in the U.S.A. is dead at the moment due to high cost and lack of financing with the exception of 3D / Advertising applications. I have done projects internationally and unfortunately most 35mm prints in the U.S.A. are garbage compared to prints made in Latin America, Thailand and other locations. 2K digital looks better than the average print.
The movie studios are pushing Digital delivery so as to bring the cinemas in line with "other" customers that "converted" such as T.V. stations that went from film / tape distribution to cable - digital delivery many years ago...it save the distributors money, not neccessary the cinemas. There are payment schedules based of VPF ( virtual print fees ) paid by distributors to cinemas to help defray financing but lack of trust, money and long term return on investment leave many clouds in the picture.
In more vertically integrated business enviroments such as India, corporations such as Adlabs can make DCI Digital Cinema progress from the existing E-Cinema base; with India small runs of 100 - 150 prints, by the time the 35mm prints play a C level cinema...E-Cinema looks better.
History repeats itself since Digital Cinema is like where sound for movies where handled in the early 1930's ( integrators, lease - finance agreements, improving technical quality )...eventually it will be the accepted standard.........The recent availability of DCP mastering programs for end users from Qube / Doremi / and Quvis should accelerate use of D.I. to independent producers.