There are SO many references to Transformers Prime in the new Transformers: One trailer
TFP styled Predacon corpses (visually similar to Darksteel and Skylynx)
STEVE THE VEHICON!!! (or rather, the vehicons lovingly dubbed "Steve" by the fans of TFP. These vehicons are incredibly similar/almost identical to their TFP counterparts)
The way the tcogs are designed is very visually similar to how they are portrayed in TFP.