(http://static2.wikia.nocookie.net/__cb20131021182127/mazinger/images/5/55/1375667_632411746780759_1814359357_n.jpg)
Yes, this is a thing. One episode made of three 10 min. shorts each month (Episode 1 is already subbed and out). Also, moe.
Here's "Episode 0" and Episode 1's preview released last year (without subs, sadly).
ロボットガールズZ 0話PV (http://www.youtube.com/watch?v=1uM2BW6Y5cA#ws)
「ロボットガールズZ」 第1話冒頭 (http://www.youtube.com/watch?v=mRgqPx7p_w4#ws)