“Lance Armstrong will come out of retirement next year to compete in five road races with the Astana team, according to sources familiar with the developing situation. Armstrong, who turns 37 this month, will compete in the Amgen Tour of California, Paris-Nice, the Tour de Georgia, the Dauphine-Libere and the Tour de France — and will race for no salary or bonuses, the sources, who asked to remain anonymous, told VeloNews. ” [Link]
All of the greats try it - Ali, Jordan etc and usually with not the best results. There is a blog post http://bicyclespokesman.com/lance-armstrong-will-come-out-of-retirement/ that gives some background on what might be motivating Lance to return