E3 2012's secret trend: crowd-control strategy
Of course, the most noticeable exemplar of this sudden trend is Pikmin 3, but it's not the only game to show up this E3 that is about guiding a swarm of little critters around to fight big enemies and destroy obstacles. XSEED showed off Acquire's rhythm-based Orgarhythm, in which a strutting god is surrounded by element-based troops, and Konami brought the Vita sequel to Little King's Story.
Platinum Games sort of got into the act as well with its Wii U launch window game Project P-100, which is still about recruiting and controlling a bunch of random citizens; however, you have less individual control of them than in the other games, and instead you use their pure mass to form a weapon. It still totally counts for the purpose of an informal article, though.