TFCToys' Weibo Page has posted the final color images of upcoming combiner limbs Warning Line, better known as Protectobot Groove, and Aethon, better known as Predacon Tantrum. These figures will form legs for Prometheus/Defensor and Ares/Predaking. See the pictures below!
At the time of posting, no stores had preorders up for Warning Line and Aethon yet. Groove in particular makes a really nice leg!