Flatpak 1.0 Released, Ready for Prime Time
Ready to ruin the security of Linux, you mean. The split between package vendor and package maintainer has classically been the primary reason for malware being rare on Linux. Getting maintainers out of the loop for auditing packages, ensuring security updates go out, etc - is an awful idea. Sandboxing applications is great, but it can be done without subverting the package manager.