Pro Wrestling Torch has reported that WWE wrestlers are being tested for viral meningitis, a disease that might be effecting several people on the roster. This would certainly explain why two top stars have been removed from the TLC card just 48 hours before it's scheduled to take place.
As for their replacements, Kurt Angle will be wrestling in WWE again for the first time in more than 11 years as he teams with Seth Rollins and Dean Ambrose in a TLC match against Kane, The Miz, Braun Strowman and The Bar.
Reigns later faced Braun Strowman in a cage match, only for Kane to make a shocking return and burst through the bottom of the ring. It will be Angle's first televised match for WWE since August 8, 2006, against Sabu on the then-recently relaunched ECW brand.
One can only assume from this announcement that Angle's return had been in the works and likely planned for the buildup to WrestleMania 34 in 2018. He was inducted into the WWE Hall of Fame in the same month. Angle has repeatedly stated that an in-ring return was likely at some point in the future, and while the timing isn't ideal now, WWE was clearly in a bind given Reigns' illness and the importance of the Shield match on the TLC card.