The Zinken ("Zink - en", "ink" pronounced as in "ink pen") Testnet for Ethereum 2 Phase 0 will launch on Monday, October 12, 2020 at 1200 UTC, 8am EDT. Both Medalla and Spadina had issues with validators being offline at launch and minor client bugs. The developer community feels that it's important to have an ideal testnet launch before moving to Mainnet launch.