Just because the cars supporting Combo will not be available until early 2013 is not a reason not to deploy the Combo infrastructure beforehand. Indeed to support volume adoption of the Combo plug cars, the charging stations must be installed first. From early 2013, BMW i3 will be available as well as VW Up followed by Renault and then BMW's i8.
That leads me to anther point, which is that the GM led and SAE endorsed standard will be supported by nine car manufacturers not eight. Renault [Nissan partner http://en.wikipedia.org/wiki/Renault-Nissan_Alliance" onclick="window.open(this.href);return false;] did not participate in the EVS26 announcement of eight, but announced support for this standard separately. One benefit of the SAE standard is that it is also supported by the ACEA in Europe, something which CHAdeMO is not. So there is USA/EU agreement, but it is not perfect without Japan, South Korea and China, all of which have gone in different directions.