Basso is not there, but Schleck is from CSC. 4th last year, he loves this TDS, and as during the Tour he will be fully behind Basso, I would not be surprised, if he tried to put the pressure ( with the help of a strong CSC team ) to make Ullrich doubt on his capacities.
Schleck to win mountain stages, Cancellara to win the final time trial would be a blow mentally to Ullrich just before the start of the Tour. I guess it will be either Ullrich beats them all without any problem, or if starts struggling, he will refrain from attacking at this year's TDS and stay on "training mode".