1) Fu & Torune:
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So will they be back in time for the war? It seems to be implied.
2) We now know that "that jutsu" isn't kyuubi control. Why would the frog say to him; "here's the Fourth's seal, that'll give you the ability to control the kyuubi! oh, and also it's your ticket to perfecting a way to control the kyuubi"...
It'd be the same thing... So chances are, it's another jutsu.
3) Edo Tensei:
Summoning: Impure World Resurrection is a forbidden technique used to revive the dead. The ninja will first sacrifice a living person to provide the vessel that the dead soul will inhabit. The dead body will then be encased in ash and dirt to resemble the original body of the person that was resurrected. When the ninja wishes to recall the souls, a portal will open in the ground and the caskets holding the bodies will appear. When the caskets open the bodies will be gray and in a state of minor decay, requiring a special seal to restore their appearance. At this point, the revived person remembers their former lives, and thus is not under the user's control. The same seal used to restore their appearance also wipes the soul of its free will, putting them under the user's control. This technique can be used to summon multiple people at once, depending on the amount of sacrifices and the chakra level of the user.
Once complete, the revived is impossible to be killed by normal means. If a limb is destroyed or removed, it will simply regenerate. To kill the revived, the soul has to be removed. Once this is accomplished, the bodies turn back to ash and dust, with the bodies of the individuals sacrificed lying among the ashes.
As it uses the souls, rather than the bodies, it isn't important where they are. Kakazu was with Konoha, Itachi was with Akatsuki, Sasori was a puppet, Nagato was with Konan, and Deidara was obliterated. Which is why it's clear the bodies aren't required, the souls are. Obviously, this doesn't work on Hidan since he isn't dead, just trapped underground in little pieces. I'm glad, though. Stealing corpses and DNA didn't really sound like Tobirama's style
Also suggests that only moves like the Death God seal can take care of them?
4) Anko! <3