I hadn´t time to model the new trooper, because I want to finish some other units first. here´s an Alien mothership jumping through a "dimension gate" (idea from XCOM Apocalypse) then landing - this is how they get their "cities" (which are in fact landed ufos). The Alien settler unit will be a very small ufo, the probe, which searches for a good location for a new base - then the big mothership will "warp down" as in this preview below 
