From what I’ve read, we shouldn’t get too excited since the IOC members are a fickle bunch. Anyway, here is the article that was in Around the Rings. Here are the rankings according to an online bookmaker:
Online bookmaker Intertops.com says
Chicagois on the money as 4/5 favorites followed by Tokyoat 9/4, Rio 9/2 and Madrid 13/2 – and similar odds are being offered by bookmakers around the globe. But gamblers are warned, IOC members are an unpredictable bunch and odds makers have been wrong for the past three consecutive bids including 2010, 2012 and 2014.
The next major deadline is February 12th, 2009 when the candidate cities submit there final plans.