In the email from November 14, Bitcoin developer Greg Maxwell described updates to the technology of confidential transactions, which would make the information about transactions more private and let the amounts be seen only to sender, receiver and the parties they choose to share information with through sharing watching keys or through revealing single transactions.
Charlie Lee, Litecoin creator, in a response to the abovementioned statement claimed that he is looking forward to adding such improvements to Litecoin in future as to address the lack of fungibility which he believes to be the only feature that Bitcoin and Litecoin are missing. He states the improvements may happen in a form of a soft fork.
Update on Confidential Transactions (CT) by Greg Maxwell: https://t.co/1x7RDY3wLS
Previously CT txns are ~16x size of normal txns. New breakthroughs by Benedikt Bünz and Jonathan Bootle results in only a ~3x size increase. CoinJoin can combine txns to make this negligible!
— Charlie Lee (@SatoshiLite) 14 November 2017
The main advantages of confidential transactions are the absense of any substantial new cryptographic assumptions, a high performance compared to alternatives, there is no trusted setup, and they don't involve the creation of any forever-growing unprunable accumulators.
Reddit.com users comments towards Confidential Transactions
The members of Bitcoin and Litecoin communities are looking forward to improvements to transactions which will ease the practical usage issues which are of current interest for many.