According to the source, a social media post claims an Ethereum upgrade named Fusaka will go live on December 3, 2025 and target up to 10x higher data capacity via PeerDAS to benefit Layer 2 rollups, source: X post dated Sep 19, 2025. PeerDAS is formally specified in EIP-7594 as peer-to-peer data availability sampling designed to expand blob data bandwidth for rollups, which directly lowers rollup data costs versus calldata, source: EIP-7594. EIP-4844 (Dencun) previously introduced blob data that reduced rollup data costs and enabled lower L2 fees, providing a baseline for how increased data bandwidth can affect L2 economics, source: Ethereum Foundation blog on Dencun and EIP-4844. Before positioning, traders should verify any upgrade name and timeline on official venues where confirmations are typically published, including the Ethereum Foundation blog and Ethereum AllCoreDevs call notes, source: Ethereum Foundation blog; Ethereum AllCoreDevs notes. If PeerDAS is scheduled, trading-relevant monitors include L2 blob utilization, blob fee dynamics, and rollup throughput, as these metrics influence L2 activity and ETH usage for data publication on L1, source: EIP-7594; EIP-4844.