Cross-chain upgrades are easier to judge when the first release has a clear boundary.

Optimism Foundation and Uniswap Labs' October 22 plan starts with native ETH transfers between Unichain and OP Mainnet, subject to technical readiness and governance approval. General token transfers and a single shared liquidity pool aren't included in that initial scope.

For $UNI and $OP watchers, I'd look for the separate activation proposal next. Preparatory upgrades alone won't switch interoperability on.