Looks like the Magic is going to be sailing out of four different ports from now until December 2012:

Barcelona, Spain - June thru September 2011
Port Canaveral, Florida - September thru December 2011 and January thru May 2012
New York, New York - May 2012 thru September 2012
Galveston, Texas - September 2012 thru December 2012

The Wonder will be making a 14 night Hawaiian sale out of Los Angeles in April 2012. Unfortunately this cruise seems to be sold out. The rest of the time the Wonder will be sailing out of Seattle, Washington and Vancouver, British Columbia, Canada to Alaska and then also out of LA to the Mexican Riviera.

The Dream will be making the Bahamian cruises once The Fantasy joins the fleet which will be taking over the Caribbean cruises.

The Magic and The Fantasy will be overlapping Caribbean cruises for about two months from March to May 2012.

*This information is all based on the DCL website.