I do not think the release their GUI will affect the price that much. It will for sure help make the coin easier to use bringing in more users but that is it. The price rise would depend on how much the whales pump it and how many ordinary people join in with the ongoing hype.
Amen. Price is made by the trading of exchange IOU that have the same name as the crypto currency. Most exchanges have graphical interfaces, so most of the trading is already done using graphical interfaces. Very few people influencing the market price use real block chain interaction. Block chains essentially serve as ways to transact coins between exchanges and to convert them into web IOU there.
Yes, there are a few people using crypto for real, like on DNM, but that doesn't have much influence on market cap.