He's supposed to infilitrate a contrived party-setting to evaluate the A-Laws where he meets a supposedly female look alike. That is probably her, unless he attends the party as a woman.
Fans have been hard at work since the very second this image came into public.
This 'woman' might not be one of the three tube people called Innovators. Since from what I could tell so far Tieria or other Innovators are biological if not 100%.
Maybe this 'woman' is either just another one or the original genetic source for Tieria.
Or maybe it simply is Tieria. You know he'd do anything for a mission and he isn't exactly the manliest guy ever. Besides, didn't he already do this in a drama CD?
except if tieria really is a girl. Then it's the hawttest thing ever. Both the names Nadleeh and Tieria(possibly derived from Tiresias) are mythological gender-benders.