Governance subsystem (proposals, votings, etc);
Dispute Resolution subsystem;
Factories; Contract upgradeability; Contract registry; Library support: code <-> storage.
Thetta is NOT A "smart contracts operating system (OS)". We do not want to end up building a "Windows" with Registry, DLL/EXE loader, Cache and Network layer. Instead, Thetta is a small and easy-to-use tool for developers.