I know HT teases this type of thing every year, which is to be expected to keep the hype going and collectors engaged. Hopefully there will be some surprises, such as the Batman Forever line. The word that jumps out to me is "completing," which of course could mean anything and different things to different collectors. That said, here's what I'd like to see "completed" (yep, some of these are deep cuts):
Star Wars -- Bespin Lando, Bespin Han, Slave Leia, Oola; Queen Amidala, Geonosis Padme, Ep II Anakin, Ep II Obi-Wan, Qui-Gon, Mace Windu, Aayla Secura, Senate Guard, Senator/Emperor Palpatine; Andor, Baze; Snoke
MCU -- Yellowjacket, Valkyrie (white costume), Ultron Sentry
DCEU -- Cyborg, Mera, Black Manta, Orm
'66 Batman -- Batmobile, Batgirl (w/motorcycle), Joker, Newmar Catwoman, Riddler, Penguin
Terminator -- T-850 endo, TX endo
Alien -- Queen, Ripley (+Power Loader)
Predator -- Dillon, Blaine, Mac
Avatar -- Neytiri, native Jakesully, Quaritch (+ mech)
TRON Legacy -- Quorra, Gem, Clu