as a user I would like to:

Create a new deployment type
- Assign hostgroups (and maybe config groups?) which are part of this deployment type
- assign allow compute resources / bare metal discovery per hostgroup
- assign parameters across the deployment, define required parameters per deployment etc
- assign deployment order (which hostgroup is needed first?)
- assign minimum number of hosts per hostgroup/deployment

I'm sure there are more, some background can be used from both stacker https://github.com/ohadlevy/stacker (and maybe the engine branch -> https://github.com/ohadlevy/stacker/tree/engine) and staypuft (https://github.com/theforeman/staypuft).