Rikudo cant be dead...(spoiler alert)
According to the following interview, which has been confirmed...well...just read it
SJ = Shonen Jump
MK = Masashi Kishimoto
SJ: There's many rumours regarding Madara being the absolute final villain. Is this true?
MK: Madara being the final villain is yet to be seen and I can't let that information out just yet. But he will play a big part as a villain, that's for sure.
SJ: Now that it's officially known that Yondaime is Naruto's father, will you show more of Minato?
MK: Yes, definitly. I actually wanted to reveal more about Yondaime earlier, but other characters were in development and some fights still had to be dealt with.
SJ: While we're at it... could you please tell us if Minato was the strongest shinobi that ever lived?
MK: Hmmm, it's a tricky question. As far as dead shinobis goes, then yes, he's the strongest. I'd say that Sandaime shares the number one spot with him. As far as living shinobis goes... well, without going into many details I'd have to say no. There's a couple of shinobis whose stronger than him.
SJ: Now that Itachi seems to be dead, what is Kisame going to do now?
MK: Kisame has always come off as a sidevillain whose only purpose is to travel along Itachi. But to my surprise, Kisame has gone from an unpopular character to someone whose more popular than Deidara after the Gai-fight. I won't say too much, but Kisame is a character that wont die anytime soon. I will definitly develop on his character more and possibly make him...
SJ: Make him what?
The minato question, if rikudos dead...that means...minato is stronger than him. WHAAAAAAAAAAAAAAAAA!? Look at the bolded stuff
AS far as the stuff i italicized...looks like someones stronger than the 4th already...and whos that. SASUKE!