The throne we previously saw is cardboard and the plastic packaging disc behind it can store all the Prime Masters. Four Prime Masters can be connected to the Scepter of Sparks accessory as you can see in the photos below. It is still unclear if the crown can come off or not. We do see the smaller Optimus Primal figure which is mostly unchanged from the mass release version aside from a painted crotch.
Here is a breakdown of the Prime Masters included in this set, courtesy of fellow Seibertronian JelZe GoldRabbit.
Amalgamous: retool of Cloudburst/Micronus Prime (so he gets the Waverider shell...)
Nexus: retool of Submarauder/Alchemist Prime
"Matrix": retool of Metalhawk/Vector Prime, as extensive as Bludgeon

Prima: retool of Octopunch/Solus Prime
Here is the description from the SDCC blog.
Hidden Remote has Hasbro’s latest San Diego Comic-Con exclusive, the Transformers: Generations Power of the Primes Throne of the Primes. The SDCC exclusive set features Nexus Prime, Amalgamous Prime, Prima Prime and the Legendary 13th Prime Comic-Con exclusive Prime Master figures. There’s also a Scepter of Sparks accessory, designed to hold four Prime Master figures. The Halo of Primus display can be used to create a display of Prime Master power, with the ability to hold 12 Prime Master figures. No word yet on pricing, but we’ll update when we know more.














