Gamified Proof of Stake (GPoS) is an enhanced DPoS based consensus model. In addition to the gamification, GPOS also introduces witness vote decay where by end users will be encouraged to elect active or otherwise best blockchain producers.
You can learn more about GPoS here : https://community.peerplays.tech/concepts/consensus-mechanisms-compared#gamified-proof-of-stake

We believe SONs is the best possible way to bring interoperability and collaboration amongst all chains. We welcome everyone who wants to help make this a reality. Our focus, and our mission, is on interoperability. For example, Bitcoin transactions can be available to the Peerplays DEX users at "lightning speeds" of under 3 seconds. With HIVE-Peerplays integration via HIVE-SONs, HIVE blockchain users can also get access to the fast performance and settlement. This will also be extended to Ethereum in the future.