It certainly looks like it as the following can be found on the Tanglewood homepage:
Let's zoom in a bit:
The Steely Dan advertisment says the band will be playing the Koussevitzky Music Shed on July 26 at 7 in the evening and that tickets in the price range $25-150 go on sale February 6.
By the way, Tanglewood is, according to Wikipedia, "an estate and music venue in Lenox and Stockbridge, Massachusetts. It is the home of the annual summer Tanglewood Music Festival and the Tanglewood Jazz Festival, and has been the Boston Symphony Orchestra's summer home since 1937."
This also answers the question wether the band would tour or not in 2011. Some Steely Dan fans figured a Donald Fagen solo tour to promote his upcoming album could be an alternative.
And as you may or may not know Fagen toured with Michael McDonald and Boz Scaggs in 2010 while Steely Dan had a break from the road after touring every year 2006 - 2009.
With this first date publicised more questions appear:
* How many dates will there be?
* US only or other parts of the world as well?
* Will Walter and Donald do solo stuff on this tour?
Upon reading that the July 26 date will be at the Koussevitzky Music Shed we for a minute suspected that the tough economic climate finally has hit the Steely Dan organisation, and that the tour will consist of small venues and sheds. But apparently a shed isn't always a ... shed. This is what we found searching for a picture of the venue: