I'm not sure if they're planning this or not, but one thing a new exchange could do is quantize the trading. I have seen serious suggestions that having trades execute only on the hour, or even as radically as once per day, could perhaps significantly reduce the short-term focus of the stock. The idea here is to greatly reduce the influence of the stock's price movement on its own price. Since that sentence probably looks like a typo, let me say it another way: Stock prices react to information, and one of the loudest and most continuous bits of information is the stock's own minute-by-minute motion, far dominating things like "press releases", actual news, or quarterly reports for which it is sensible to see significant motion on the stock price.

Even if people set up the inevitable backchannels or side markets, the fact that shares can only change hands once per day may still have a significant impact on the shape of the market, even if it isn't perfect.