Starwood Preferred Guest (SPG) and Caesars Entertainment Total Rewards started their partnership on January 9, 2014 (read more here).
SPG has not informed their members about the end of this partnership at all but Caesars sent out an email just before Christmas informing total Rewards members about the discontinuance of this partnership effective December 31, 2016.
You can access SPG’s web page for this partnership here.
SPG members were (still are until 31st) able to earn nights (no stays) towards their Gold or Platinum status (max 10 nights per year). These nights didn’t count towards the lifetime requirement, however. Members earn Starpoints for their folio charges at participating Caesars properties in addition to the Total Rewards points.
The Hyatt’s partnership with MGM properties still continues. Not sure if all the SPG employees are already laid off as there have been no communication from Starwood about the state of this Caesars Entertainment partnership.