I never expected that Obito could do this, especially in a condition so close to death. I mean, when it took three days for Akatsuki to seal just one Bijuu, its hard to grasp that Obito could do it instantly.
None the less, I dont believe this means that Obito will be the final villain.
A likely scenario is that Obito did actually become the Juubi's Jinnchuriki, but might have the Juubi pulled out of him by the Soul removing Rinnengan Jutsu (forgot name).
A somewhat likely scenario is since the juubi is now within a Jinnchuriki, perhaps Naruto will Talk no jutsu it like the other Bijuu?