I haven't checked this information, but...What I have read is that UCI regulations in place demand the shorts to be either white ot from the trade team.
If so, he's making the right choice. No one needs to remember Saronni of that possibility for next year ( lampre shorts+WC jersey = )
Also...that article says Tour of Beijing will be his last race. But yesterday there was an interview with him at RTP (radio televisão portuguesa) and the reporter finished the piece by saying Rui Costa's program is Lombardia-Tour of Beijing-"a race in Japan" (which I assume is Japan Cup)
What, carry bottles in the World Champion jersey? That Rui is such a great domestique
OK seriously, that shirt he's wearing is his excuse for the next year. As is going to a team where he's expected to be a leader. Nope, he never did do a whole lot of pulling for his teammates. But we probably can't criticize him for that anymore.