Yeah, I think it's either an excellent fake, or the real deal. The George Harrison is spot on, Paul's big loopy "L" and the scribble in McCartney, how the y trails off in McCartney, even the "H" in john lennon all look good to me. Can't tell with Ringo's either way, but he consistently signed on himself while the others used the white space.
Also the fact that it's on a slight variation of the classic photo is interesting, almost makes it seem more legitimate to me but I'm not sure why.