For now I don't see any too much demand when it comes to another new exchange considering on the current numbers of exchangers do exist on the market and I don't see necessary features yet most of them are already available but since you do ask about features and things I do prefer then KYC should be removed. Security would be always the top priority which is normal for an exchange to focus on, Fast support responsive, Low fees, Lite GUI and preferring to have technical tools can be used up on charts.