On the 1st of June 2018, LEGO released pictures of three Frozen characters entering the Brickheadz theme namely 41617 Elsa and 41618 Anna & Olaf.
Soon thereafter images of the boxart turned up online as well as the catalogs for the 2nd half which shows that it will be launched in July 2018 or Aug 2018 together with the Harry Potter themed ones and the Darth Vader and Stormtrooper Brickheadz.
Click here for the updated full list of known Brickheadz sets
Also revealed in the same pages of the LEGO catalogs are teasers for the long rumoured Mickey/Minnie Mouse Brickheadz which means they will definitely be coming in 2018.
High Resolution images has been updated into the LEGO servers on 6th June and we reproduce them here. (Click to enlarge in flickr)