This is NOT a new feature, I cant even remember how long this has been working, but this morning I saw a Tweet when someone was happy about the possibility to copy items between deployment shares in MDT, so for thoose that knows all this, you do not need to read more, for the rest of you.
Yes, you can copy items between Task Sequences
(it also works copy items within a Task Sequence)
This works in both MDT as well as in ConfigMgr.
Yes, you can copy items between Deployment Shares (Only for MDT, Lite Touch)
In this case I have 3 deployment shares in the Deployment Workbench and it is possible to copy all kind of items between these 3 deployment shares
Let us copy some application from one deployment share to another.
Select Application, right click and select Copy.
Browse to new location, right-click, select Paste.
The application has been copied to the new deployment share.