Hi Ricardo, just a quick heads up.  I'm working with Ryan here on getting this new vexpress board set up and created a new image based on the proposed 12.05 and ethernet appears to be broken.  We don't even see an eth0 device come up.  The previous release that Ryan tested worked fine with ethernet though.
The previous image he had tested was based on:
http://snapshots.linaro.org/precise/hwpacks/vexpress/55/hwpack_linaro-vexpress_20120521-55_armhf_supported.tar.gz
http://snapshots.linaro.org/precise/images/ubuntu-desktop/170/linaro-precise-ubuntu-desktop-20120521-170.tar.gz

Thanks,
Paul Larson