you will need ArcGIS Desktop.
ArcGIS Pro will be part of ArcGIS Desktop.
ArcGIS Pro will be released with the version 10.3 (December 2014).
You will need a named user to activate ArcGIS Pro.
You can download ArcGIS pro here (prerelease version): https://marketplace.arcgis.com/listing.html?id=2d2a9c99bb2a43548c31cd8e32217af6
There you can also find some more information about licensing
