As much as I freaking love the lore from the 7th & 8th Doctor novels created by Lawrence Miles, Lance Parkin, Kate Orman and Marc Platt, I really hope he doesn't go that route either. I love the Looms, The Other and his wife Patience and the Doctor's parents Time Lord Ulysses and Victorian mad scientist (and accidental inventor of human time travel) Penelope Gate, but I completely understand that these parts of the Whoniverse are controversial as fuck.
Moffat's brief nod to it in Hell Bent ("Are you the hybrid? Are you half-human?" "Does it matter!?") was the perfect way to go. People that love The War/Faction Paradox side of the Whoniverse got a rare nod to that part of the canon. Those that hate it had that nod be ambiguous enough that they can still ignore it altogether.
EDIT: Useless fact of the day: The ancient Gallifreyan Hybrid prophecy regarding The Doctor actually originated in Kate Orman's 8th Doctor novel Unnatural History (1999).