So... what could this be?
Rotate to what seems to be the original orientation:

It's apparently something printed out in poster size. But what's that image got to do with UT, besides the label "Liandri"? It looks too detailed to effectively be part of the play area (as we learned, Epic don't want to clutter the maps with stuff like this anymore), so what is it?
Unreal Engine 4 advertisement? A hint that there will be a UT movie?
Rotate to what seems to be the original orientation:

It's apparently something printed out in poster size. But what's that image got to do with UT, besides the label "Liandri"? It looks too detailed to effectively be part of the play area (as we learned, Epic don't want to clutter the maps with stuff like this anymore), so what is it?
Unreal Engine 4 advertisement? A hint that there will be a UT movie?