Although the installer obtains the type of keyboard from the user at the beginning of the installation, Xconfigurator (called by installer) does not appear to detect this info, or have a way to be passed this info by installer. The result is that, after standard installation, the console works correctly, but X uses a mismapped keyboard for everyone except those with a pc101/us keyboard (who are admittedly in the majority). The fix would be to add an option to Xconfigurator to override default XkbModel and XkbLayout; installer could then pass correct parameters.
The new installer which will ship in the next release has this bug fixed. The keyboard selected at the beginning of the installation is indeed passed into Xconfigurator and written to the XF86Config file.