The results are in, and one of the US teams came in second overall! Details (including individual medalists) in the MAA's press release.
I couldn't find an official site for the CGMO, but the UKMT has posted the problems on the British Math Olympiad site.
PRI's The World radio program had a 3-minute interview with two of the team members (Lynelle Ye and Elizabeth Synge). You may also enjoy reading the girls' travel blog on the MSRI website.