It can't be, as it's gotten too personal.
However, ultimately it doesn't matter. The tour sounds exciting, and Billy sounded excited about the music. If we get something that sounds like "old" SP, then it doesn't matter who's on bass (as it didn't matter then).
I'd say when the dust settles on all of this, D'arcy will come back in some capacity. That of course depends what her interview is on the "Lennon Remembers" scale.