I want to use some of the new extras modules (especially virt_net and virt_pool), so here are my notes on building the Ansible 2.0 RPM for Fedora 23.

sudo dnf install asciidoc rpm-build python-devel
git clone git://github.com/ansible/ansible.git --recursive
cd ansible/
make rpm
sudo dnf -y install ./rpm-build/ansible-2.*.noarch.rpm

ansible --version

One note — it is possible I already installed some packages necessary for building Ansible, and so the list of packages I installed may not be sufficient.  If you stumble across any, please let me know and I will update this post.