This is the second release candidate for modules/light-clients/08-wasm v10.0.0.
The main changes are noted in ibc-go's release notes: https://github.com/cosmos/ibc-go/releases/tag/v10.0.0-rc.2
Special notice for the 08-wasm release are:
Ethereum light client support
While the main Ethereum light client support is implemented as a separate 08-wasm CosmWasm smart contract in the solidity-ibc-eureka repo, there is a new blsverifier querier that enables BLS verification in CosmWasm.