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Kejsarens återfödelse har först beskrivits som möjligt i "Riket av Chaos: Lost and the Damned". Det finns den (redan nämnda) teorin om Star Child och Sensei, bevakad av Illuminati:
Star Child
As the spirit of the Emperor drifted through the warp, it gradually dissolved into the flow of energy, returning to the cosmic force of the nature of the warp in its uncorrupted form. Only a tiny core of the Emperor's humanity remained whole, like a small child bobbing upon the tide of a colossal storm in a tiny reed boar.[...] For just as the New Man had been born from the collective souls of the shamans of old, so the Emperor's soul might be reborn one day. But that day would lie far in the future when the cries for a new saviour would strengthen the core of the Emperor's soul and rekindle it into a new life.
Meanwhile the soul of the Emperor was a merely a potential, a child awaiting birth, the Star Child.
Sensei är kejsarens sanna barn:
The Star Child also has his Champions, known as the Sensei. Although they do not necessarily know their true identity, these people are actually descended from the Emperor's own descendants and their genetic structure is similar to his.[...] Although they can be killed hey do not age and possess amazing powers of recovery. They radiate natural confidence and harmony, and can even draw upon the energies of war to use their psychic powers [...] without attracting demons or other malicious psychic forces.
Information om dessa två bevakas av den mystiska organisationen som kallas Illuminati:
The Illuminati are a secret society, existing beyond even the Emperor's knowledge, but manipulating and interpreting the Imperial Will to bring about their objectives.Every member is a part of the society by virtue of being "illuminated" through the experience of daemonic possession, and finally salvation. Possessed by a daemon, they have done what seems impossible, exorcising the daemon from their body through their own sheer will.[...] The Illuminati influence events to pave the way for the Emperor's rebirth, and gather together the Sensei, protecting them from the persecution of the Inquisition.
Även om deras planer angående Sensei inte är så välvilliga:
The Illuminati plan to rejuvenate the Emperor by sacrificing His descendants, the Sensei, at the moment the Emperor's will finally fails. The Emperor will be reborn, as the Sensei-Emperor, to again lead humanity directly. Their plans are a carefully kept secret; should the Emperor learn their plan, He may see no reason to continue to endure, and allow Himself to die prematurely. Should the Sensei learn, they may be unwilling to meet their intended fate.
Nu har informationen om Illuminati visats i åtminstone en bok: "Inquisition War" av Ian Watson, så det är ett koncept som i teorin fortfarande ligger inom 40k universum, men sedan dess publicering 2004 var det Ingen ytterligare information om denna grupp i några andra böcker, även om 1d4chan nämner att:
In the third edition, as part of general grimdarkification and realizing that the whole Star Child thing made about as much sense as Space Marines being all beakie space cops, Games Workshop said that the Inquisition had decided that they were actually a Tzeentchian cult that plotted to kill the Emperor and plunge the Imperium into Chaos. They have since been eradicated entirely.
In short, they were long since retconned and are unlikely to be making any further appearances.
Vad är nu en kanon är den information som den gyllene tronen misslyckas och det är mekaniker vet inte hur man fixar det, som beskrivs i 5: e upplagan av Warhammer 40 000 5: e utgåvan regelboken
Tl; dr
Det har blivit omnämnt som möjligt en gång, sedan dess har det blivit retconned och nu är allt vi vet att kejsaren kommer att dö snart-ish (om han inte kommer)