Alex Zanardi is currently concentrating on marathons via his wheelchair aka handcycle.

http://www.alex-zanardi.com/

as far as I can tell he hasn't raced cars since the 2009 WTCC, I'm not sure he could handle the extra high g-forces in an Indycar at a highspeed banked oval like Vegas without leg support/strength but I could be wrong. Also as neat as it would be in one way to have him compete i think the man has gave enough to the sport and doesn't need to be sucked into a hyped up promotional deal like this and risk further damage or worse, and I'm sure his family has been thru enough. Whatever he does he remains a credit to the sport with his fighting spirit still strong....