Just purchased a SE Hatch w/ DCT on March 22, 2012.
The car drove smooth during the test drive (37 miles at the time) and for the first hundred miles or so. Now, with 677 miles on the odometer, I have definitely noticed the above mentioned issues (shuddering in 1st gear, uneven acceleration etc.). I have a build date of October 2011, so I am hoping the 12-01-04 TSB will fix the issue. I am going to schedule an appointment with the service department today. Hopefully I have a positive experience. I will let you all know if I hear anything different/unique.
Thanks for all your input and comments, very informative. Besides the DCT issue I love the Focus. I traded in my 2006 Audi A4, and so far I am not missing it.