After already being delayed from the original beta announcement, Media Molecule teased the beta for Dreams Monday on Twitter.
Media Molecule announced a “Totally normal dreams stream” Tuesday, Dec. 18 at 5:00 pm GMT / 9:00 am PT.
PS4’s Dreams was originally announced in 2015 at E3, with a beta announced at Sony’s Paris Games Week keynote that same year, for the beta to come in 2016.
Source: IGN.com PS4's Dreams Potentially Teasing Beta Announcement