I voted Cantina Aliens. Since they seem to be doing these in twos, we could finish some of the unmade aliens.
The first one could be: Dannik Jerriko (smoking man), Hrchek Kal Fas (Bossk type alien), Hem Dazon ("T" head)
The second set: Elis Herlot (ghost face), Feltipern Trevagg (gotal) and M'iiyoom Onith (hummingbird type)
Here's a link to a site that shows all the aliens scene by scene.
and Star Wars.com has good shots of the masks.
There's still a ton of aliens for them to make after those 6.
Defel (wolfman red eyes)
Bom Vimdim the Advozsec
Brainiac (brain head)
Trinto Duaba (white face with hood)
Lirin C'arn (Bith)
Leesub Sirln (bald weird girl waitress)
Tonnika Sisters (duh)
Rycar Ryjerd (Flash Gordon midget)
Sai'torr Kal Fas (Bossk type #2)
Danz Borin (grey flight suit and helmet with square yellow visor)
Yerka Mig (boring human with blonde hair)
Mosep (red jumpsuit, seal/otter type face)
Swilla Corey (blonde girl)
Solomahol (fat bat face alien)
Dice Ibegon (snake thing with Lak Sivrak)
Merc Sunlet (another boring human)
Garouf Lafoe (still another boring human)
Nimbanel (red jumpsuit, yellow ponytail on top of his head)
The ghost face alien called Elis Herlot is in the WEG books & CCG cards
a listed on Starwars.com as being in the cantina, but he's not shown in the sceen shots.