I'm not sure if it's just me, but the bookmarks are completely screwy in this beta. I'm seeing quadruple copies in the drop-down and all sorts of beta-esque problems. The Opera bookmark manager has always been a weak point for them. Reorganizing your links and adding them to you personal toolbar shouldn't be as much of a hassle. For example I have a set of links I often visit set into the personal toolbar. If I drag all the links from the bookmark manager and it's sorted alphabetically then they will show up on the toolbar in reverse alphabetical order...things like that. It's been that way for years.
The only changes I'm not too thrilled with are whatever they did to the Gmail compatibility. Gmail works a lot better in 8.5x than this beta. I'm hoping they fix that in the final.