Here's a summary of the first episode of the Naruto Shippuden. It follows the the adventures of Naruto, 2 and a half years after he left Konoha to train under Jiraiya.
Sakura and Naruto are running around a maze-like underground structure looking for something. Yamato sensei is briefly shown. It turns out that the new Team 7 is looking for Sasuke. Naruto screamed Sasuke's name. A big explosion follows. It led them to the direction of Sai, the new teammate who's not a bit hurt and is looking at Sasuke. Sakura came to scene first and was surprised to see Sasuke after a very long time. Naruto seems speechless as well.
A flashback of their last battle follows, focusing on their dialogue about losing, keeping and breaking bonds.
Naruto cannot contain himself anymore and asked Sasuke regarding his decision to not eliminate Naruto if he truly desires to cut the bond. Sasuke gets flashbacks of Itachi telling him about the secret of the Mangekyou Sharingan. He tells Naruto that he wants the bonds to be cut, but he didn't kill Naruto as the act would please Itachi, who's been putting on too much pressure on Sasuke to be like him and earn the Mangekyou already.
And to prove his point that sparing Naruto's life then was done out of whim, he flew down to Naruto's direction. Sakura was impressed by Sasuke's speed. Sasuke then blabbers about Naruto's Hokage dreams and how he should not waste looking for Sasuke instead of training. He draws his sword. Naruto replied that someone who cannot save his friend isn't worthy of such title.
The Kyuubi, still portrayed in Naruto's conscousness as one imprisoned through a sealed gate tells Naruto that it is time to show their powers. Naruto seemed disspirited though despite the fact that the bubbles which eventually leaked out of the gates take the shape of a giant Kyuubi. Kyuubi tells Naruto that the boy's pretty useless without him and tries to trick him into opening the seal to have his full power unleashed.
Sasuke enters the picture. He now knows the source of Naruto's unlimited powers. Kyuubi seems to recognize that Sasuke is an Uchiha. Kyuubi complimented Sasuke who grew tremendously enough to see him. He says it's an ability of the clan who has the Sharingan, and Sasuke's eyes are so powerful, it's even stronger than him and it is reminiscent of someone named Uchiha Madara. Sasuke rips a part of the form assumed by the Kyuubi while saying admitting that he's got no clue about the Uchiha he's taliking about.
New opening theme
It gives some clue as to which arcs would be tackled. Most notable is the part where Gaara, who carries the new Kazekage batttle outfit, deteriorates into sand, Kankuro, Temari, Sakura and Naruto extends their hands in desperation. Also noteworthy is the part on Akatsuki. And of course to those who tried the mangas during the filler arcs, it's pretty obvoius that they're to get a lot of moments in the spotlight, at least in the arcs published so far. And the fact that team Gai's solely the chuunin arc team getting some action may indicate the possibility that their affair with Kisame would be animated too.