Source: Wrestling Observer Newsletter
As noted, WWE pulled WWE World Heavyweight Champion Brock Lesnar from next Monday's Slammy Awards RAW and now have him scheduled to return on the post-TLC RAW on December 15th.
WWE originally had Lesnar booked for the Slammys because they felt he was needed since he will likely be up for a few awards. However, he was pulled because it's the go-home show for TLC and and he ended up not booked for the pay-per-view. Essentially WWE didn't want to waste one of Lesnar's dates. It appear the Lesnar changes were a late decision.
Regarding future plans for Lesnar, we noted that he is booked for the post-WrestleMania 31 RAW in San Jose. That is believed to be Lesnar's final scheduled event on this current contract.
Source: http://www.wrestlinginc.com/wi/news...kstage-news-on-brock-lesnar-current-wwe-deal/
They should've totally had him come back on next week's Slammy Awards RAW episode, it'd make the episode that much better with the WWE-WHC being around again. But, oh well...