Nested Matrix as field types Are nested matrices panned for the coming future releases?

I currently have a matrix where users can upload various assets. For each asset, they should be able to specify different details but this cannot be achieved with the current features as there is no way in which the details could be related to a particular asset that has just been uploaded.
I'll let Brandon and Brad answer regarding what's planned. :) 

But, couldn't you solve this by adding fields to your assets? You can make fields of whatever type and add them to the field layout of asset sources. To edit them, you just double-click on the asset in the matrix. This works both for existing assets and newly uploaded assets as far as I can tell.