This version of the character no longer has a "Powermaster" engine, but instead continues the trend of Titans Return by having a head that transforms. As with Galvatron and Blaster, a "helmet" fits over the standard sized head. The Titan Masters gimmick, which homages the G1 Headmasters concept, enables the line to have large Transformers that transform into bases and vehicles that are compatible with the smaller Titan Masters figures.
If you're not familiar with Powermaster Optimus Prime, make sure you check out the original G1 version from 1988 by clicking here.
This toy is an extremely extensive retool of Combiner Wars Leader Class Ultra Magnus. During a conference call earlier this week, Hasbro stated that there's not much left of the Ultra Magnus toy in the Powermaster Optimus Prime retool.
Powermaster Optimus Prime will be shipped in a case assortment alongside Blaster, who was revealed last month at a Hasbro press event the night before New York Comic-Con. Both figures make up the Titans Return 2016 Wave 1 case assortment.

Titans Return Leader Powermaster Optimus Prime 01 Robot

Titans Return Leader Powermaster Optimus Prime 02 Robot 2

Titans Return Leader Powermaster Optimus Prime 03 Vehicle

Titans Return Leader Powermaster Optimus Prime 04 Base

Titans Return Leader Powermaster Optimus Prime 05 Minifig APEX 2

Titans Return Leader Powermaster Optimus Prime 05 Minifig APEX