Adding Dynamic Data Blocks

I am considering doing this one myself and as this has been requested so often I wanted to ask if this is already being worked on and if not maybe people would like to give some input. The way I picture it working is kind of like a form with a container block where you define the data source, method (post/get) for getting the key and if it is a one time data item or a looped item like a list or a set of cards. Then you would insert a dynamic template block with placeholders for your data items which define the columns. For a list that would mean a table row and for a set of cards it would be...