Attempting to install Katello 3.0RC, using the following repositories

yum -y localinstall https://fedorapeople.org/groups/katello/releases/yum/3.0/katello/el7/x86_64/katello-repos-latest.rpm
yum -y localinstall http://yum.theforeman.org/releases/1.11/el7/x86_64/foreman-release.rpm
yum -y localinstall http://yum.puppetlabs.com/puppetlabs-release-el-7.noarch.rpm
yum -y localinstall http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
yum -y install foreman-release-scl

and running foreman-installer --scenario katello

fails, with the following in the katello.log

[DEBUG 2016-04-08 14:56:58 main] Exec[foreman-rake-apipie:cache:index](provider=posix): Executing '/usr/sbin/foreman-rake apipie:cache:index'
[DEBUG 2016-04-08 14:56:58 main] Executing '/usr/sbin/foreman-rake apipie:cache:index'
[ WARN 2016-04-08 14:59:11 main] /Stage[main]/Foreman::Database/Foreman::Rake[apipie:cache:index]/Exec[foreman-rake-apipie:cache:index]/returns: /opt/theforeman/tfm/root/usr/share/gems/gems/docker-api-1.17.0/lib/docker.rb:103: warning: circular argument reference - connection
[ WARN 2016-04-08 14:59:13 main] /Stage[main]/Foreman::Database/Foreman::Rake[apipie:cache:index]/Exec[foreman-rake-apipie:cache:index]/returns: Apipie cache enabled but not present yet. Run apipie:cache rake task to speed up API calls.
[ WARN 2016-04-08 14:59:13 main] /Stage[main]/Foreman::Database/Foreman::Rake[apipie:cache:index]/Exec[foreman-rake-apipie:cache:index]/returns: rake aborted!
[ WARN 2016-04-08 14:59:14 main] /Stage[main]/Foreman::Database/Foreman::Rake[apipie:cache:index]/Exec[foreman-rake-apipie:cache:index]/returns: ActionView::MissingTemplate: Missing template ../../layouts/apipie/apipie with {:locale=>[:en], :formats=>[:html], :variants=>[], :handlers=>[:erb, :builder, :raw, :ruby, :rabl]}. Searched in:
[ WARN 2016-04-08 14:59:14 main] /Stage[main]/Foreman::Database/Foreman::Rake[apipie:cache:index]/Exec[foreman-rake-apipie:cache:index]/returns: * "/opt/theforeman/tfm/root/usr/share/gems/gems/apipie-rails-0.3.5/app/views/apipie/apipies"

This seems related to http://projects.theforeman.org/issues/13710
Installing tfm-rubygem-apipie-rails-0.3.6-1.el7.noarch.rpm from http://yum.theforeman.org/releases/nightly/el7/x86_64/
and re-running 'foreman-installer --scenario katello' the installation succeeds