N4G obviously sucks, as those scans are incredibly fake, and have no right fooling anyone with brain function.
As for the "On the Way to a Smile-related content" that FF7 Citadel mentions being in the trailers. I thought this had been explained, but I suppose there are still people in the dark. ACC is including a collected paperback with all the On the Way to a Smile stories: Case of Denzel, Tifa, the Japanese version of Barret's, plus new Cases for Yuffie, Red XIII, and the Turks.
As for the OVA, I haven't heard anything neccesarily regarding one, only that ACC will include a look at something taking place two years after AC (and one year after DC). It might be an OVA or special feature, or it might just be part of the main film.
Since the Jump Festa '09 trailer showed a scene from Case of Denzel, which is a series of flashbacks framed around a conversation between Denzel and Reeve two years after AC, it could very well be a CGI version of that short story. I honestly wouldn't expect anything more, but it certainly could be something new.