Just saw this on X as well before checking if it had been submitted already: https://news.kiwistand.com/stories/Vitalik:-Railguns-privacy-pool-mechanism-for-ethical-crypto-transactions?index=0x67ade2635e3add56a3c704c8083f3c78dfbbf19e770eee7ce3f67b68c76554b2e89beccf