There's a lengthy entry on Wikipedia on Rio de Janeiro's successful bid to secure the 2016 Olympic Games. It's well researched, with over 200 links to source documents, and current up to and including Wednesday 14 October.
As yet, there's little of specific interest to IP owners and their legal advisors, but I suspect that this will change as details of specific sponsorship details, broadcasting and transmission arrangements etc become known. There's also a separate non-Rio-specific Wikipedia entry here that covers the Olympic and Paralympic symbols.
Readers of IP Tango may wish to consult these resources and indeed contribute to them.