When using the link preview pop up, it would be very convenient to have a keyboard shortcut to maximize the link into a new tab, instead of having to move the mouse to the very top corner. I think it would make the experience of the preview window a lot smoother.
I shift click on a link in Orion, or simply click on a link elsewhere on my Mac; I decide I do want to open the page in a new tab and keep working on it there. I quickly type a shortcut and the preview page opens in a new tab. Instead of moving my mouse up and over, which can take a second or two, I can instead just hit a keyboard shortcut and make the transition from preview to browser tab seamless. I personally, as well as other power users, would probably create a touchpad gesture in BetterTouchTool to be able to use a gesture to activate the shortcut and go from the preview pop-up to the browser.