Once again, there is a POSSIBILITY of it being on 2 discs. It has not been confirmed.
And that second disc limited edition crap is a rumor. The only limited edition stuff we know about is that book/strategy guide thing.
And to continue with the 2 discs. We've only heard about it once and never again. Is it really discs? We're going to have to wait and see because no ones knows. So you are asking the wrong people for a definite answer.