The video begins with a Naruto apparently killed after a fight. Sakura is bent over his body and Kakashi arrives moments after, encountering such a scene and regrets. Then we entered a long flashback with scenes of combat between Naruto and Sasuke, that combines what had just happened a few moments ago with scenes from the past . At the end of the flash back, Naruto and Sasuke clash with his classic ranzengan shidori and then turn to the present. Sakura Tears fall from his face that is suddenly touched by the hand of the blonde, causing the pinkgirl fall in a cry of relief and embrace his companion. On the other hand, for a devastated battlefield, we have Kabuto and Tobi, who seemed to be just watching the whole thing. They withdraw. Sasuke stands up groggy, but alive. He takes one hand to the eyes and smiled wickedly. The focus now is going to evolve his Sharingan, from three commas to the full form of MS. The screen is completely red and heard a throbbing heart and a crying baby.
The first question that arises is whether this video has any real implications for real plot of Naruto. Of course I could be completely wrong, but I think so.
Let us make a brief visit to Wikipedia to learn what's even an OVA.
Original video animation (オリジナル・ビデオ・アニメーション Orijinaru bideo animēshon?), abbreviated as OVA (オーブイエー / オーヴィーエー / オヴァ ōbuiē, ōvīē or ova?) media (and sometimes as OAV by English-speakers), are animated films and series made specially for release in home-video formats. The term originated in relation to Japanese animation (anime).[citation needed] Most producers of OVAs release them direct-to-video, without prior showings on TV or in theatres; however, there may be very rare occasions where, for example, the first part of an OVA series is broadcast for promotional purposes. OVA titles were originally made available on VHS, later becoming more popular on LaserDisc and eventually DVD.[1] Starting in summer 2008 the term OAD (original animation DVD)[2][3] began to refer to DVD releases published bundled with their source material manga.
OK, now we know what is an OVA, but, interestingly, the video in question is also considered a trailer. What is a trailer in wikipédia?
Trailer is a video clip to advertise a movie, television, an electronic game or other publication.
(From Portuguese wikipedia. I think the setting more objective and complete)
Thus, we might consider the video in question but as a preview of something that will still happen in the manga / anime.
Some say that crying is for the birth of a new power of Sasuke, or something. I doubt it. Notice that the red of the end is different.. It is not the same red characteristic of the sharingan. It is a more open red, resembling blood. So, we have a cry, what would be the emergence of a new generation. Generation is already born in a long war (remember that Kabuto and Tobi still alive) therefore, the blood.

Red of the Sasuke's Sharingan

Transition from red of the sharingan to a new red, with a more open tone

Fundo vermelho com as batidas e coração e bebê chorando
Recently in the manga there was some reference to the crossing of fingers between Naruto Sasuke, scene that is shown in the OVA. But in the manga the boys refuse to do so because of intense rivalry from the time of the academy. Kishimoto would be telling us something?

Naruto and Sasuke should cross their fingers as a sign of respect and friendship before the fight, but they do not, starting immediately into the fray and are scolded by Iruka.

In the ova trailer, this scene appears briefly in the middle of fight scenes between the two
I knew from this forum source, that in an interview, very old, that Kishimoto would be a good idea to do a third saga with the characters more matures. But he never talk about it again. Or he gave up the idea, or do not want to spoil the surprise. The fact is we can not forget that Naruto is now one of the best selling manga in Japan (being always between the second and third place). Not to mention the good audience from anime and movies, product sales, etc.. That is, it is a highly profitable franchise. And, in my view, would still yield very good if Kishi has willingness to continues the good work.
Algumas pessoas temem a possibilidade de uma nova saga. Eles temem o risco de cruzar com a porcaria que foi Dragon Ball GT. Neste caso, seria melhor do que Naruto tinha uma conclusão o mais rapidamente possível, de preferência no final do arco da guerra ou a luta entre Sasuke e Naruto. E um epílogo mostrando bom futuro dos personagens já seria mais que suficiente.
Maybe yes. But I honestly would not mind in accompanying a saga complete with the children of Naruto, Sasuke, Sakura, Shikamaru and Co. I really believe that the ninja worlds created by the talented Kishimoto has huge potential and many stories and characters to explore, just be creative and willingness to do so.