Thanks to Pull Request 398, implemented in Polkadot Runtime 1.3.0, base fees on all System Chains have been reduced by 50%.
As a result, USDT transfers on Asset Hub now only cost less than $0.0050!
At Protocol Berg on June 12th, Bastian Köcher (Parity) presented an overview of CorePlay, described as an actor-like framework for blockchains built on top of JAM.