Yes, you can. The International Gateway opens at the same time as the main gate. Access to WS is roped off at the bridge to France. You will be directed to the left and can explore Great Britain and Canada (nothing's open yet) as you proceed to the FW portion of the park.
12/2002 Port Orleans - Riverside
05/2006 Yacht Club
10/2007 Yacht Club (IF&WF)
12/2008 Yacht Club (Christmas visit)
11/2009 Yacht Club (50th Wedding Anniv trip)
10/2010 Yacht Club (Wine, glorious wine!)
10/2011 Yacht Club (More wine, glorious wine!)