I believe they will always give the SB Champs the right to open at home.
Plus this has nothing to do with the flex, so FOX doesn't have a say in the matter. Same as any SNF game, it is determined in April who plays when and where, and FOX and CBS have no say in the matter at all.
Giants/49ers would be nice, but we will open at home, so Giants Packers seem very logical, and it WILL draw big time ratings. Isn't that what's it's all about. ???????