There already is a link to change log on the startpage, though it is simply link to the release forum post. We are planning to add better change log page in the future.
Posts made by operawm
RE: Why is Opera GX not based on Opera Beta/Dev?Opera GX
Opera GX is based on our normal stable branch of Opera. While we are still in Early Access it focuses on our new features and we don't really want feedback for instability and bugs of our development branches. As for updating to new chromium - we will follow chromium just as normal Opera Stable does, though due to some issues it will be delayed about a week this time.