There have been many predictions on Nibiru, among other celestial objects such as Comet ISON (which people think disintegrated, but only because they haven't seen close-ups of the original - it being an artificial object.)
As for proof of it's existance, there are many 'recent' images on this subject, it's existance is far more than just archaelogical evidence of the Sumerians.
There was an image with Nibiru showing on Google Sky, at specific coordinates, then it was censored by the 'you know who.' This is an old image, I cannot find the pre-censored version, but don't you wonder why would they literally cut something out the way they have?
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There's an article with more info on this from Dec 2011,
http://banisblog.blogspot.com/2011/1...le-skywhy.html
Anyway, it's been a while since the last post of the Reptilian Interview, soon I'll post them in their proper order so they make more sense to those of you interested in knowing more.