At this point it's the constant changing of information. The NBA.com site originally showed 8 trailers lined up, and had dates for them from what I understand. The dates were removed quickly after EA explained that the dates were not from a credible source. But the 8 placeholders were still there. Now they are down to only two placeholders instead of 8.
They also had given a general timeline of when they would release footage. 5v5 gameplay was supposed to come by the end of the summer. They released some screenshots, which was great, and a trailer, which was also good, but nothing since.
I'm not saying it should scare anyone, but at this point, their marketing team needs to do some damage control. 2k's trailer today didn't show anything more than Live's a few weeks ago, but 2k also has current gen to promote, and the gaming community is not on Live's side.