Also I'll be mad if Bond 25 isn't based off the unused elements from You Only Live Twice novel now.
It actually seems, if this news is true, that they're taking elements from Ian Fleming's Octopussy novel that weren't used in that film (Hans Oberhauser is in that novel, and Waltz would be Blofeld posing as Oberhauser's son).
I think it's true. It's plausible, and this isn't a typical example of tabloid trash - it's referencing a little-known character from a Fleming novel, who has ties to Bond's past. That would fit in perfectly with the progression of Craig's Bond (Oberhauser stood in for his parents for a bit after their death), and we already know the story in the last few Craig films will be connected in an arc.
and of course, if it's true, it will FINALLY ensure everyone shuts the fuck up about that godawful "bond is a codename" theory.