So it has been assumed that, given the way Spectre left things, that Christoph Waltz would be reprising his role as Ernst Stavro Blofeld in James Bond 25.
For those who may not be overly familiar with the James Bond franchise, the tradition Christoph Waltz is, or at least seems to be, referring to is the fact that no actor since You Only Live Twice has ever reprised the role of Blofeld, 007’s arch nemesis.
It’s also entirely possible that Christoph Waltz just hasn’t been contacted about it yet, therefore, he assumes he isn’t coming back.
The cast should be confirmed somewhat soon, but don’t expect to see Christoph Waltz mentioned.