What are the rules? Who are the guys to look out for? Also what countries have a pedigree in Wrestling apart from the US. Russia? Iran? 
In
US team rosters
Men's Freestyle:
121 lbs. - Sam Hazewinkel
132 lbs. - Coleman Scott
145.5 lbs. - Jared Frayer
163 lbs. - Jordan Burroughs
185 lbs. - Jake Herbert
211.5 lbs. - Jake Varner
264.5 lbs. - Tervel Dlagnev
Men's Greco-Roman
121 lbs. - Spenser Mango
132 lbs. - Ellis Coleman
145.5 lbs. - Justin Lester
163 lbs. - Ben Provisor
211.5 lbs. - R.C. Johnson
264.5 lbs. - Dremiel Byers
Women's Freestyle
105.5 lbs. - Clarissa Chun
121 lbs. - Kelsey Campbell
138.75 lbs. - Elena Pirozhkova
158.5 lbs. - Stephany Lee
Look for Matt Gentry to stop the Jordan Burroughs Bandwagon
and here's the rulebook from USA wrestling (which includes international and Olympic rules from FILA)
www.themat.com/forms/Rulebook.pdf
lol, big read.
Check out this Bleacher Report about the US team: bleacherreport.com/articles/1155136-united-states-olympic-wrestling-roster-2012-updated-analysis-for-team-usa
Names to watch: Jordan Burroughs- USA 74Kg
Mehdi Taghavi Kermani- Iran 66Kg
Reza Yazdani- Iran 96Kg
Ravshan Bayramov- Azerbaijan 55Kg
Mijain Lopez- Cuba Heavyweight
Riza Kayaalp- Turkey Heavyweight (I hope for a Lopez-Kayaalp rematch from the Greco world Chamionships)
Damian Janikowski- Poland 84Kg