Seamless editing between applications.
I want to be able to place a creative asset inside InDesign, then right click and choose "edit in Photoshop" or "edit in Illustrator", and any saved changes would reflect in the original InDesign document.
For example, I inserted an old PDF file into InDesign because it contains a logo which I do not have the vector file anymore then resized the image block to only show the logo and not the rest of the document. Now I want to create a new vector file of the logo in Illustrator, and it would save a lot of time and effort if I could simply right click on the logo and click "open in Illustrator"; convert it into a vector image and fix niggles; save the image; and have the 'new' vector image replace the old PDF file.