Please read Alexey Sklyarenko's annotations on Pale Fire, Ada and other Nabokov works here.
At the end of his Commentary Kinbote (in VN’s novel Pale Fire, 1962, Shade’s mad commentator who imagines that he is Charles the Beloved, the last self-exiled king of Zembla) says that he may turn up yet, on another campus, as an old, happy, healthy heterosexual Russian, a writer in exile, sans fame, sans future, sans audience, sans anything but his art: