Also, if you watched the Oprah interview, he went to great lengths to admit his PED use without ratting anybody else out.
After demanding loyalty from everyone, he would be a double douchebag/hypocrite to name names. Nobody likes a rat. This is what I expected him to do. Lance should have realized before deciding to do this that he won't get his lifetime ban reduced if he's not willing to rat others out. WADA has already said he's got to tell everything he knows before they would consider reducing his ban.
UCI officials, coaches, managers, doctors, etc.
Specifically Johan Bruyneel, maybe Michele Ferrari, but he's already banned for life. But they want to know the whole system—who were the suppliers, who were the runners, techniques used to hide usage during events, techniques used to beat the tests. Lance knows an awful lot that WADA wants to learn to refine their anit-doping efforts.