panels 3

I don't figure out how to retrieve the panel's context to modifie the block's content.
Maybe would I better to make a new pane instead a new block ?
It's would be great if I could choose the context and pass arguments form the block setting in panel, like with a view.

Let's imagine I've made a custom block in a custom module like this :

This is a working thread to discuss the (still far in the future) Panels 3 UI. I want to get work started on ideas to improve the existing UI, and for the moment we are allowed to go pie in the sky and suggest features. Please assume that pie in the sky features will eventually be shot down, though, but it's on the table because sometimes pie in the sky can really work or be made to work.