I found a fix on bugzilla:
rpm -e --nodeps systemd-units
yum install systemd-units
Which created the symlinks and default.service which seemed to be missing, and allowed the boot to finish, but I may have been to quick to use it.  One CPU core is at maximum and Chrome won't open, so I'm temporarily back to upstart till I get time to look at it further.

https://bugzilla.redhat.com/show_bug.cgi?id=618315

-----Original Message-----
From: darrell pfeifer <darrellpf@gmail.com>
To: Development discussions related to Fedora <devel@lists.fedoraproject.org>
Sent: Wed, Jul 28, 2010 6:46 pm
Subject: Re: [HEADS-UP] systemd is now the default init system in rawhide



On Wed, Jul 28, 2010 at 19:33, <goineasy9@aol.com> wrote:
Add init=/sbin/upstart to the end of the kernel line and it will boot up using upstart.  Last lines in my boot read failing to load default.service and then failing to start default.service.

Check one of the recent previous messages.

ln -sf /lib/systemd/system/graphical.target /etc/systemd/system/default.target

Will solve that problem and get you a bit further along the way.

darrell