Block Batch Filters draft :

BIP 157 unlike BIP 37 not allow apply filters to mempool and check zero confirmation transactions.

Light client that refused to use BIP 37 due to privacy leaks can process unconfirmed transactions only one way and this is loading the entire mempool transaction flow.

Mempool Transaction Filters draft:

Summary:

    - improved Block Batch Filters definition

    - unlocked ability to filter unconfirmed transaction for SPV nodes used BIP 157 instead of BIP 37 due privacy leak in BIP 37

    - more bandwidth consumption reduced in contrast with block filters and downloading full blocks for affected addresses

    - proposal for future consensus layer soft-fork to make block filters commitment one of the block validation rule to protect light nodes from payment hiding attack