He might be shocked at first. Naruto has always had a complex relationship with the Kyuubi, so finding out his mother is somehow related to it would turn his world upside down. He would probably have a million questions running through his head and would need time to process such a huge revelation.
Well, initially, Naruto would likely be stunned. Given his journey of coming to terms with the Kyuubi inside him, this new information would be like a bombshell. He could feel a sense of confusion, like why his mother had this connection. But then, he might also start to see things in a new light, perhaps realizing that there were deeper reasons behind his own abilities and his connection to the Kyuubi all along. It could also make him feel a new sense of pride or determination, as if there was more to his heritage than he ever knew.
Naruto would be in complete disbelief. His whole life he has known the Kyuubi as a powerful and often feared entity within him. Discovering that his mother has a connection to it would be a mind - boggling concept. He may start to question everything he thought he knew about his family. At the same time, it could give him a new perspective on his own strength. Maybe he would start to think that his mother's connection to the Kyuubi was part of a grand plan that somehow led to him being the person he is. He might also feel a sense of responsibility to understand more about his mother's connection and how it affects his role in the ninja world.
It could mean that Naruto has a more powerful and mysterious heritage. His abilities might be even more special than previously thought.
Naruto might initially be shocked and angry. He has always considered the Kyuubi as an enemy within him, and now being kidnapped by it is the worst - case scenario for him. He could try to fight back immediately, using whatever little chakra he can muster without relying on the Kyuubi's power.
Naruto might initially be confused. He has grown up with a certain view of himself, and this new information about his heritage completely shatters that. He may struggle with his identity for a while, but as he digests the information, he could start to feel a sense of pride. He might think that now he has a greater purpose, something that ties him more closely to his family and the ninja world in general. He may also become more confident in his abilities, knowing that he comes from a great lineage.
Tsunade could be impressed by the power of the Kyuubi suit. Given her own strength, she would appreciate the additional boost it gives Naruto. She might even see it as a valuable asset in protecting the village and start to develop strategies around how Naruto can best use the suit in combat situations.
Naruto might initially be shocked and hurt. After all, being expelled by his own family is a huge blow. But being 'godlike', he could quickly turn that pain into determination. He might decide to prove his worth and show his family that they made a big mistake.
He's probably shocked at first. Naruto has grown up without his parents, and suddenly having grandparents appear is a huge surprise.
Sasuke would likely act like he doesn't care much. But secretly, he might be a bit intrigued as to why Naruto is into such things. He might think it's a waste of time or he could see it as another way Naruto is different from him.
Sakura might tease Naruto about it a little. She'd probably think it's a bit strange that he's interested in something so different from their own world. But she'd also be curious to know what it's all about.
He would be overjoyed. Naruto has always desired a family, so seeing them again would make him extremely happy.
He could then feel a deep sense of anger. Naruto has a temper, especially when it comes to those he loves. He might vow to find out the reason for the betrayal and make things right, or if it was truly malicious, seek revenge in his own Naruto - like way, which would involve trying to understand the person's motives even while being angry.