I got an answer that it will not be scheduled for 2014. Please vote if you like to have it too.
Have you already checked the HowTo's?
Generally, you can only pass a guid or guids (mendix id for object) to a microflow.
Check out the API docs for good examples.
Check out the mx.data.action function call.
Have a look at the "String Input Microflow Widget" from the appstore. This will allow you to pass a string to the widget and use this as the input for the microflow. Not for 5.8.1 yet, but this could give you an idea on how to do this.
I am passing the dataview and I am able to display the plot, but I am not able to even get the call to the microflow working. Is there a widget in 5.8.1 available that at least calls the microflow successfully.
Also, can I update the entity in the dataview before passing it to the microflow. What I am trying to accomplish is to allow the user to select a point on the scatter plot and send the id of that point to the microflow so that I can display additional information for that id.
Thanks for any help you can provide for this,