the Ethereum consensus-layer –
Altair is here; the Merge is coming. tl;dr Altair upgrade epoch set, mainnet client releases in progress 
Merge interop spec released. Devnets to follow 
Altair upgrade, Oct 27 Altair, the first mainnet upgrade to the Beacon Chain, has been scheduled for epoch 74240 (Oct 27, 2021, 10:56:23am UTC)….
