I created a small userintface via:
CloudDeploy[ExportForm[expr,"CloudCDF"], "/cdftest"]
This is how it looks.

This contains code to URLFetch data from a MongDB server. It also uses ImportString to translate the JSON. It works fine and since I used the option "CloudCDF" in deploying it to the web it must be a Cloud CDF. I conclude all functions are possible and no pro-player upgrade is needed.
The only thing is it looks like a notebook and I need to remove the layout because the intention is to build a customer interface.
If i read the cloudobject via CloudImport["/cdftest","Text"] it starts with Notebook[ .... ]. I suspect the page is evaluated by a cloudkernel and then formatted to look like a notebook by a css file.
The main question remains -what is the difference between a cdf embedded player and a CloudDeploy to a CloudCDF object.-
Any ideas?