The existing one is non-lvm which probably sets people up for trouble in the future. I changed mine to:

zerombr yes
clearpart --all --initlabel
part /boot --fstype ext3 --size=200 --asprimary
part swap --recommended
part pv.01 --size=1 --grow

volgroup VolGroup01 pv.01
logvol / --fstype ext4 --name=root --vgname=VolGroup01 --size=1 --grow

Maybe we could do something similar by default in foreman. They should get a 200M /boot, self-calculated swap and a single giant LVM logvol of /. It's enough to get them started without being too clever!