On the January 21st recording of Koubudo TV, the host, who is Shinya Aoki’s manager, (pretty much) said that DREAM have already reserved Saitama Super Arena for an event this year. This event will not be together with GLORY like the one on New Year’s Eve, it will be separate and DREAM’s own schedule.
He also said that the New Year’s Eve DREAM opening production (the whole event really) left a deep impression on the GLORY higher-ups. “How can they do something this flawless?”-like astonishment.
GLORY do not own Dream, I found this info though.