According to my Toyota dealer the answer is yes. That is why I have a 2005 XLE on order (I was waiting for 2 power front seats). However, even though they are now making 2005's in production, I can't find any more information about them.
The 2011 Toyota Sienna has 39.1 cu.ft. of cargo capacity with all of its seats in place.
The 2002 Toyota Sienna has 26.6 cu.ft. of cargo capacity with all of its seats in place.
The 2008 Toyota Sienna has 43.6 cu.ft. of cargo capacity with all of its seats in place.
The 2009 Toyota Sienna has 43.6 cu.ft. of cargo capacity with all of its seats in place.
The 2014 Toyota Sienna has 39.1 cu.ft. of cargo capacity with all of its seats in place.
The 2001 Toyota Sienna has 26.6 cu.ft. of cargo capacity with all of its seats in place.
The 2004 Toyota Sienna has 43.6 cu.ft. of cargo capacity with all of its seats in place.
The 2010 Toyota Sienna has 43.6 cu.ft. of cargo capacity with all of its seats in place.
The 2012 Toyota Sienna has 39.1 cu.ft. of cargo capacity with all of its seats in place.
The 2007 Toyota Sienna has 43.6 cu.ft. of cargo capacity with all of its seats in place.
The 2013 Toyota Sienna has 39.1 cu.ft. of cargo capacity with all of its seats in place.
The 2006 Toyota Sienna has 43.6 cu.ft. of cargo capacity with all of its seats in place.