HBK is advertised for a "special appearance" while this is being billed as Taker's return to RAW.
Shawn stars in "The Resurrection of Gavin Stone," a faith-based movie from the Harvest Bible Chapel's Vertical Church Films and WWE Studios, which comes out on January 20th. It's possible his appearance is tied to the release of that movie.
As of this writing, Taker and Michaels are not listed on WWE's website or the Smoothie King Center website but reader Jack G. sent us this screenshot from a localized Facebook ad from WWE:
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