I would quess no because of
1. https://repos.fedorapeople.org/repos/...
2. https://wiki.openstack.org/wiki/Kilo_...
3. Devstack git repo status

root@junoFedora21 ~]# git clone https://git.openstack.org/openstack-dev/devstack
Cloning into 'devstack'...
remote: Counting objects: 25853, done.
remote: Compressing objects: 100% (11865/11865), done.
remote: Total 25853 (delta 18399), reused 20888 (delta 13746)
Receiving objects: 100% (25853/25853), 5.17 MiB | 1.27 MiB/s, done.
Resolving deltas: 100% (18399/18399), done.
Checking connectivity... done.
[root@junoFedora21 ~]# cd dev*
[root@junoFedora21 devstack]# git branch -v -a
* master                         4e81d24 Merge "Add some discussion about review criteria"
  remotes/origin/HEAD            -> origin/master
  remotes/origin/master          4e81d24 Merge "Add some discussion about review criteria"
  remotes/origin/stable/icehouse d795232 Take an optional rabbit user name as input
  remotes/origin/stable/juno     660faae Merge "Ensure quoting of selected API extensions" into stable/juno

As soon as "remotes/origin/stable/kilo" will appear you would be welcome to test via devstack on F21, most probably F22
In meantime master works on F21 with some upgrades via Fedora Rawhide.

 # yum -y install git  fedora-repos-rawhide
 # yum --enablerepo=rawhide install python-six  python-pip python-pbr systemd