Marta here, from Trello Support.
While it's not currently possible to have an overview like that, you could create a "Master board" and link cards from your different boards to that board.
There's a few Power-Ups that can help you keep cards in sync. The first is Cardsync, which you can read about here: http://info.trello.com/power-ups/cardsync
If you're looking for more options such as syncing entire boards, check out Board Sync by Unito. https://info.trello.com/power-ups/unito/board-sync
I hope that helps!
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