No, it's not "we know where he goes." We don't know where he goes unless we've seen the OT first. The deal with the Yoda scene is that it shows a primary character going into exile. We see where Obi-Wan goes, we also see where Bail Organa goes, but not Yoda. I think when he sees the saga as a whole, he will add that scene back in. And the rebellion scenes did such an incredible job tying ROTS to ANH, that he would be crazy not to add them back in.