Thank you!! That's the most requested feature so far :) The challenge is to come up with gestures that work regardless of the toolbar configuration, but since this has been the most requested feature and I badly need it for my own browsing as well, it's very high on the todo list :)
Swiping on the address bar - horizontal to switch tabs, vertical to enter tab overview - is one of iOS Safari’s best features. It prevents me from using any other browser that doesn’t have this. It was even one of the main reasons to not use Orion, which does the navigation but only has a static animation that doesn’t match the actual swiping movement. Apple did set a high bar with UX, but it’s really good.