Not only did they add the Batman movies, but they added a ton of comics.
I could be wrong, but I made a sweep of the comics yesterday and today and noticed some today that I didn't yesterday:
The Arrow comics
The Dark Knight Returns #2-4
Harley Quinn and Power Girl
Starfire
Young Justice
were some of the ones I noticed today that I didn't notice yesterday. Maybe I completely missed it earlier, but that would be surprising since I made a list of everything I wanted to read and would have added all of those in it.
Also for those looking for something fun, Harley Quinn and Power Girl is a BLAST. The run is quirky and easy to read, and Harley and Peegee has a TON of chemistry.
I would appreciate greater transparency, but considering it's Day 1 then i think it's whatever. It would be inconvenient to make sweeps of everything every time I opened the site.