When you begin working with RC0, you may find yourself searching for Activity Monitor. I personally spent about 10 minutes looking for Activity Monitor when I started working with RC0. Luckily, I happen to work at Microsoft and can directly email people when I have these types of questions (well, lucky for me but perhaps not lucky for them:-))
In the past, you could only find Activity Monitor by opening the Management folder in SQL Server Management Studio. This is no longer the place to find Activity Monitor. Here are the two new ways to launch Activity Monitor:
1. Open Management Studio. Select the icon on the toolbar that is the furthest right (It looks like a chart with green and blue lines).
2. In Object Explorer, right click on the server and select Activity Monitor. Please note that the Activity Monitor is not available in the context menu unless you select the server. You cannot launch the Activity Monitor when you select a database, another folder, etc.
I am certain many of you are questioning why there was a change in location for the Activity Monitor. I was told that the intention was to make it "more discoverable". This provided me a great deal of humor as I spent 10 minutes looking for it and ended up asking the product team.