There has already been threads that strongly prove that Naruto comes from the whirlpool country and is related to the senju clan. you have the whirlpool thing on naruto's arm, The name uzumaki mean "whirlpool" and when Naruto was on his journey with Jiraya you can see whirlpool signs hanging from the light poles. Jiraya also talkes about Naruto's mother Kushina Uzumaki was from the "Former" Whirlpool Country, at means the country was taken over in a war, or it fell apart from internal strife and it's lands absorbed by neighboring countries.
We already know that there is a senju bloodline, the mokuton. The question that is interesting to find the answer to "what is the uzumaki bloodline?" the bloodline to hopefully be inherited to naruto from his mother, who came from the whirlpool country. A country before its downfall.
Because if there aren't any uzumaki bloodline limit, then why would they make such an effort in giving clues and giving the uzumaki name and heritage such a big role in the manga?
The former battles between the younger and the older brother's descendants were fought with bloodline limits. I'm highly positive that it so will this time.
The revealing of Naruto's bloodline limit will probably not be shown until a long long time from now, this to keep the story going. Imagine Sasuke fighting Naruto in the next chapter
that would put a quick end to the story.
That Naruto is related to the Senju is very much a fact. Both Madara and Jiraya has made that clear. His bloodline limit is just yet to be revealed.
correct me if I'm wrong
