Cyclone 4 with DDR memory interface?

There are plenty of references to OCT in the Cyclone IV handbook. This includes sections specifically about external memory interfaces. For example, in one spot the handbook states, "This section discusses Cyclone IV memory interfaces, including DDR input registers, DDR output registers, OCT, and phase-lock loops (PLLs)."

My experience has been that Cyclone IV is very similar in features to Cyclone III. This is especially true when comparing Cyclone III to Cyclone IV E in which case the parts seem to be virtually identical. The Cyclone IV GX adds the significant feature of the high speed transceivers.