BIP-151 has been withdrawn. There has recently been a little bit of activity, https://github.com/bitcoin/bitcoin/pull/18242 https://github.com/bitcoin/bitcoin/

BIP-151 has been withdrawn. There has recently been a little bit of activity, https://github.com/bitcoin/bitcoin/pull/18242 https://github.com/bitcoin/bitcoin/pull/18242 but without major cultural changes or several new and eager contributors I don't think this functionality is likely to be completed and deployed any time soon.