A little bit more on roundabouts with 10.8.1. An ice storm prevented me from testing much with 10.8, but the releases supposedly are the same with regard to FSD beta. I was able to navigate a number of single lane roundabouts easily, but the traffic level was low to modest. FSD beta no longer comes to a complete stop before entering, unless there's traffic in the circle.
It has also stopped using its turn signal before entering a roundabout. Even if using the turn signal when entering is a legal requirement in some jurisdictions, it's confusing to other drivers and the last thing we need is more confusion with regard to roundabouts.
Multilane roundabouts are still a major disaster. Even with no traffic, FSD beta tries to use the roundabout's center lane if the navigation tells it to use either the 2nd or 3rd exit. I find it hard to believe that the cause is faulty local mapping. It seems like a logic error.
If I was to suggest something to the FSD beta team, it would be to always use the outer loop in a double lane roundabout. This seems counterintuitive if any of the feeder roads are multilane but for now I would always have FSD beta use the right lane when entering a multilane roundabout.