The new Experiment puts all the recommended videos in the activity stream and you can ** longer restrict the stream to uploads. If you click the "my subscription" link from the sidebar, you can hide the recommendations. YouTube shows too many recommended videos and they're **t always relevant.
The right sidebar only shows recommended channels and topics instead of the list of video recommendations. A**ther change is that you can mouse over an item from the activity stream, click the arrow icon and access options like: "hide this activity", "unsubscribe", "only show uploads from this channel". There are also some new filtering option for subscriptions: click the arrow next to the search box from the left sidebar and you can sort the channels by name, new activity or relevance (the default option).