I Rsync'd Rawhide Sunday, and burned the 64 bit boot.iso.
An NFS install failed when it failed to find repomd.xml.
Yes, this is known. There's a problem bringing up the network from the
stage2. You can work around this by adding updates=garbage or some
other invalid URL to the boot arguments. That'll bring up the network
early, though you'll have to hit cancel when it tries to download the
bad updates URL.
- Chris